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      <title>MATEMATICA - 3 M by Carla Mancini</title>
      <link>https://padlet.com/carlamancini/matematica3M</link>
      <description>Corso serale 2017/18</description>
      <language>en-us</language>
      <pubDate>2017-10-14 12:58:38 UTC</pubDate>
      <lastBuildDate>2023-01-21 15:51:08 UTC</lastBuildDate>
      <webMaster>hello@padlet.com</webMaster>
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      <item>
         <title>I NUMERI NATURALI  N</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/197024449</link>
         <description><![CDATA[<div><strong>I numeri naturali N</strong>:<br><br></div><div><br>&nbsp;Sono i numeri che nascono per l'esigenza di contare e i primi numeri che impariamo a scuola:<br>&nbsp;0,1,2,3,4,5,..........<br>&nbsp;partono dallo 0 e sono infiniti!!!<br>&nbsp;Sono tutti positivi e con essi possiamo svolgere le operazioni di addizione, sottrazione, divisione, moltiplicazione (prodotto).<br>&nbsp;si indicano con la lettera N:<br>&nbsp;N= 0,1,2,3,4,5....................<br>&nbsp;<strong>APPROFONDIMENTO</strong>= <br> Per le varie operazioni possiamo avere delle proprietà, ecco uno schema semplificato per capire un pò di più.<br> <br><strong>ADDIZIONE<br></strong><br></div><div>1-&nbsp; &nbsp; &nbsp;PROPRIETÀ COMMUTATIVA<br><br></div><div>a + b = b + a<br>2 + 3 = 3 + 2<br>5 = 5 ecco dimostrato ...:-)<br><br></div><div>2-&nbsp; &nbsp; &nbsp; &nbsp; PROPRIETÀ ASSOCIATIVA<br><br></div><div>(a + b) + c = a + (b + c) = a + b + c<br>(2 + 3) + 4 = 2 + (3 + 4 ) = 2 + 3+ 4<br>5 + 4 = 2 + 7 = 9<br>9 = 9 = 9 &nbsp; ecco dimostrato</div><div>3-&nbsp; &nbsp; &nbsp;ELEMENTO NEUTRO 0<br><br></div><div>a + 0 = 0 + a = a<br>2 + 0 = 0 + 2 = 2<br>rimane sempre 2....lo zero non influenza l'operazione..<br><br></div><div><strong>MOLTIPLICAZIONE<br></strong><br></div><div>1-&nbsp; &nbsp; &nbsp; PROPRIETÀ COMMUTATIVA<br><br></div><div>a x b = b x a<br>2 x 3 = 3 x 2<br>6 = 6<br>esce lo stesso risultato se invertiamo l'ordine ....<br><br></div><div>2-&nbsp; &nbsp; &nbsp; PROPRIETÀ ASSOCIATIVA<br><br></div><div>(a x b) x c = a x (b x c) = a x b x c<br>( 2 x 3 ) x 4 = 2 x (3 x 4) = 2x3x4<br>6 x 4 = 2 x (12) = 24<br>24 = 24 = 24&nbsp;<br>esce sempre lo stesso risultato...invertendo i numeri &nbsp;<br><br></div><div>3-&nbsp; &nbsp; &nbsp; ELEMENTO NEUTRO 1<br><br></div><div>a x 1 = 1 x a = a<br>2 x 1 = 1 x 2 = 2<br>1 è l'elemento neutro della moltiplicazione, cioè non influenza il risultato...<br><br></div><div>4-&nbsp; &nbsp; &nbsp; LEGGE DI ANNULLAMENTO DEL PRODOTTO<br><br></div><div>2 x 518 x 0 x 174 = 0<br>anche se usiamo numeri grandi, se in mezzo troviamo lo zero..sempre zero esce!!<br><br></div><div>5-&nbsp; &nbsp; &nbsp; PROPRIETÀ DISTRIBUTIVA DELLA MOLTIPLICAZIONE RISPETTO ALL’ ADDIZIONE<br><br></div><div>a x (b + c) = a x b + a x c<br>2 x (3 + 4) = 2 x 3 + 2 x 4<br>2 x (7) = 6 + 8<br>14 = 14<br>praticamente il numero che si trova fuori parentesi si distribuisce all'interno della parentesi moltiplicando i numeri che trova all'interno della parentesi&nbsp;</div><div><br>&nbsp;<strong>SOTTRAZIONE<br></strong><br></div><div>1&nbsp; &nbsp; &nbsp; &nbsp; - PROPRIETÀ INVARIANTIVA<br><br></div><div>Se aggiungiamo (o togliamo) uno stesso numero sia al minuendo che al sottraendo, la differenza non cambia:<br><br></div><div>a – b = (a + c) – (b + c)<br>4 - 3 = (4 + 2) - (3 + 2)<br>1 = (6) - (5)<br>1 = 1</div><div>a – b = (a – c) – ( b – c)<br>4 - 3 = (4 - 2) - (3 - 2)<br>1 = (2) - (1)<br>1 = 1<br>se aggiungiamo lo stesso numero o lo togliamo otteniamo lo stesso risultato.</div><div>2&nbsp; &nbsp; &nbsp; &nbsp; - PROPRIETÀ DISTRIBUTIVA DELLA MOLTIPLICAZIONE RISPETTO ALLA SOTTRAZIONE<br><br></div><div>(a - b) x c = a x c – b&nbsp; x c<br>(4 - 3) x 2 = 4 x 2 - 3 x 2<br>(1) x 2 = 8 - 6<br>2 = 2<br>lo stesso vale se abbiamo:<br>a x (b - c)<br>2 x (4 - 3) = 2x4 - 2x3<br>2 x (1) = 8 - 6<br>2 = 2<br>cioè il numero lo troviamo prima e quindi si distribuisce all'interno della parentesi.</div><div><br></div><div><strong>DIVISIONE<br></strong><br></div><div><strong><br></strong>1 –&nbsp; PROPRIETÀ INVARIANTIVA&nbsp;<br><br></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (a x c) : (b x c) = a : b<br>(4 x 3) : (2 x 3) = 4 : 2<br>(12) : (6) = 2<br>2 = 2</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (a : c) : (b : c) = a : b&nbsp;<br>(8 : 2) : (4 : 2)) = 8 : 4<br>4 : 2 = 2<br>2 = 2<br><br></div><div>2-&nbsp; &nbsp; &nbsp; LO "0 NELLA&nbsp; DIVISIONE<br><br></div><div>0 : a = 0 perchè "0" per "a" mi da "0"<br><br></div><div>a : 0 = IMPOSSIBILE perché non esiste nessun numero che moltiplicato per 0 mi da "a"!!!<br><br></div><div>0 : 0 = INDETERMINATO perché esistono infiniti numeri che moltiplicati per 0 mi danno come risultato 0.<br><br></div><div>3-&nbsp; &nbsp; &nbsp; PROPRIETÀ DISTRIBUTIVA DESTRA DELLA DIVISIONE RISPETTO ALL’ ADDIZIONE E ALLA SOTTRAZIONE<br><br></div><div>(a + b) : c = (a : c) + (b : c)<br>(4 + 8) : 2 = (4 : 2) + (8 : 2)<br>12 : 2 = 2 + 4<br>6 = 6<br><br></div><div>(a – b ) : c = (a : c ) – (b : c)<br>(8 - 4) : 2 = (8 : 2) - (4 : 2)<br>4 : 2 = (4 ) - (2)<br>2 = 2&nbsp; ecco dimostrato</div><div>MA QUESTA NON VALE:&nbsp;<br><br></div><div>a : (b + c ) ≠(a : b) + (a : c)<br>8 : ( 4 + 2)&nbsp; ≠ (8 : 4) + ( 8 : 2)<br>8 : (6) ≠&nbsp; (2 ) + (4)<br>8/6 ≠&nbsp; 6<br>4/3 ≠&nbsp; 6<br>risultati diversi..quindi in questo caso la proprietà distributiva non vale a sinistra&nbsp; ma solo quando "il numero" si trova a destra !!!<br><br></div><div><strong>&nbsp;<br></strong><br></div><div>&nbsp;<br><br></div><div><br><br></div>]]></description>
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         <pubDate>2017-10-14 13:01:20 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/197024449</guid>
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         <title>LASCIATE APERTA LA PORTA ALL&#39;ERRORE, SOLO COSÌ ENTRERÀ LA VERITÀ. (Tagore</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/197125003</link>
         <description><![CDATA[<div>BUON LAVORO RAGAZZI!!!</div>]]></description>
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         <pubDate>2017-10-15 15:49:21 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/197125003</guid>
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      <item>
         <title>I NUMERI INTERI Z</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/198146945</link>
         <description><![CDATA[<div><strong>I numeri interi Z</strong>:<br><br></div><div><br>&nbsp;Sono i numeri che hanno sia i segni positivi che negativi:<br>&nbsp; - 3, - 2, - 1 , 0,1,2,3,4,5,..........<br>&nbsp;sono infiniti!!!<br>&nbsp;Con essi possiamo svolgere le operazioni di addizione, sottrazione, divisione, moltiplicazione (prodotto).<br>&nbsp;si indicano con la lettera Z:<br>&nbsp;Z= - 3, - 2, - 1, 0,1,2,3,4,5......<br>&nbsp;<strong>APPROFONDIMENTO</strong>= <br> Per le varie operazioni possiamo avere delle proprietà, ecco uno schema semplificato per capire un pò di più.<br> <br><strong>ADDIZIONE VALGONO LE STESSE PROPRIETÀ DEI NUMERI NATURALI E IN PIÙ:<br></strong><br></div><div><strong>ogni numero ha un OPPOSTO: cioè un numero che sommato ad esso mi da zero: +2-2 = 0.<br></strong><br></div><ul><li>Concordi se hanno lo stesso segno</li><li>Discordi se hanno segno diverso</li></ul><div><strong>ADDIZIONE<br>&nbsp;<br></strong><br></div><div>1-&nbsp; &nbsp; &nbsp;PROPRIETA’ COMMUTATIVA<br><br></div><div>a + b = b + a<br><br></div><div>(-2) + (+3)&nbsp; = ( +3) + (-2)<br><br></div><div>- 2 + 3&nbsp; = + 3 – 2<br><br></div><div>+ 1 = + 1&nbsp;<br><br></div><div>2-&nbsp; &nbsp; &nbsp; &nbsp; PROPRIETA’ ASSOCIATIVA<br><br></div><div>(a + b) + c = a +&nbsp; (b + c) = a + b + c<br><br></div><div>(- 2 + 3) + 4 = - 2 + (3 + 4 ) = - 2 + 3 + 4&nbsp;<br><br></div><div>(+ 1) + 4 = - 2 +&nbsp; (7) = 5<br><br></div><div>5 = 5 = 5<br><br></div><div>Cambiando l’ordine otteniamo lo stesso risultato.&nbsp;<br><br></div><div>3-&nbsp; &nbsp; &nbsp;ELEMENTO NEUTRO 0<br><br></div><div>a +&nbsp; 0 = 0 + 1 = a<br><br></div><div>-&nbsp; 2 + 0 = - 2<br><br></div><div>Sommando qualsiasi numero per 0 ..il risultato non cambia&nbsp;<br><br></div><div><strong><br></strong><br></div>]]></description>
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         <pubDate>2017-10-18 09:50:08 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/198146945</guid>
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      <item>
         <title>I NUMERI RAZIONALI</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/198146990</link>
         <description><![CDATA[<div>pagina 2 </div>]]></description>
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         <pubDate>2017-10-18 09:50:21 UTC</pubDate>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/199888391</link>
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         <pubDate>2017-10-24 08:48:36 UTC</pubDate>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/199919443</link>
         <description><![CDATA[<div>I NUMERI RAZIONALI <br>PAGINA 1 </div>]]></description>
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         <pubDate>2017-10-24 11:13:37 UTC</pubDate>
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         <title>https://youtu.be/p9pcvtwQzLo</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/199920480</link>
         <description><![CDATA[<div><br>VIDEO SPIEGAZIONE </div>]]></description>
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         <pubDate>2017-10-24 11:17:38 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/199920480</guid>
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         <title>3m serale...</title>
         <author></author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/205995178</link>
         <description><![CDATA[<div>Blocco del traffico a Frosinone viaggiano soltanto le targhe dispari. X molti ci sono problemi. <br>mannaggia </div>]]></description>
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         <pubDate>2017-11-12 16:09:44 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/205995178</guid>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/216263879</link>
         <description><![CDATA[<div>Lezione del 14/12/17 potenze e proprietà</div>]]></description>
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         <pubDate>2017-12-14 17:57:46 UTC</pubDate>
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         <title>Esercizi per casa...dicembre 2017</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/216666363</link>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/216666427</link>
         <description><![CDATA[<div>303</div>]]></description>
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         <title>304</title>
         <author>carlamancini</author>
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         <pubDate>2017-12-16 09:59:22 UTC</pubDate>
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         <title>305</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/216666489</link>
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         <pubDate>2017-12-16 09:59:54 UTC</pubDate>
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         <title>306</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/216666509</link>
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         <pubDate>2017-12-16 10:00:21 UTC</pubDate>
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         <title>Monomi 3</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/217663255</link>
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         <pubDate>2017-12-21 10:07:56 UTC</pubDate>
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         <title>Monomi 2</title>
         <author>carlamancini</author>
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         <title>Monomi 3</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/217663496</link>
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         <pubDate>2017-12-21 10:09:40 UTC</pubDate>
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         <title>Monomi 4</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/217663687</link>
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         <pubDate>2017-12-21 10:10:55 UTC</pubDate>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/217663993</link>
         <description><![CDATA[<div>Monomi 5</div>]]></description>
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         <pubDate>2017-12-21 10:13:00 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/217663993</guid>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/217664150</link>
         <description><![CDATA[<div>Monomi 6</div>]]></description>
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         <pubDate>2017-12-21 10:13:57 UTC</pubDate>
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         <title></title>
         <author>ArteBeautyCraft</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/266138387</link>
         <description><![CDATA[<div>Piano cartesiano</div>]]></description>
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         <pubDate>2018-06-07 15:36:18 UTC</pubDate>
         <guid>https://padlet.com/carlamancini/matematica3M/wish/266138387</guid>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/266143078</link>
         <description><![CDATA[<div>La retta ...</div>]]></description>
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         <pubDate>2018-06-07 15:56:54 UTC</pubDate>
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         <title></title>
         <author>carlamancini</author>
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         <description><![CDATA[<div>Intersezione con gli assi...</div>]]></description>
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         <pubDate>2018-06-07 15:57:41 UTC</pubDate>
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         <title></title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/266143483</link>
         <description><![CDATA[<div>Vari casi di coefficienti angolari</div>]]></description>
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         <pubDate>2018-06-07 15:59:05 UTC</pubDate>
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         <title>Rette parallele agli assi</title>
         <author>carlamancini</author>
         <link>https://padlet.com/carlamancini/matematica3M/wish/266143714</link>
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         <pubDate>2018-06-07 16:00:19 UTC</pubDate>
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