6A_Bai 15: Quy tắc dấu ngoặc by Thầy Khoa Phương

Câu hỏi trang 67 Toán lớp 6

khoavnkg — 2021-12-23 08:40:37 UTC

Viết tổng sau dưới dạng không có dấu ngoặc rồi tính giá trị của nó:

(-23) – 15 – (-23) + 5 + (-10).

khoavnkg — 2021-12-23 08:40:44 UTC

Bỏ dấu ngoặc rồi tính các tổng sau:

a) (-385 + 210) + (385 - 217);

b) (72 - 1 956) - (-1 956 + 28).

khoavnkg — 2021-12-23 08:40:51 UTC

Tính một cách hợp lí:

a) 12 + 13 + 14 – 15 – 16 – 17;

b) (35 – 17) – (25 - 7 + 22).

BÀI 3.21

khoavnkg — 2021-12-23 08:40:59 UTC

Bỏ dấu ngoặc rồi tính:

a) (56 - 27) - (11 + 28 - 16);

b) 28 + (19 - 28) - (32 - 57).

khoavnkg — 2021-12-23 08:41:07 UTC

Tính một cách hợp lí:

a) 21 - 22 + 23 - 24;

b) 125 - (115 - 99).

Bảo Trân

nguyenhoangbaotran0404 — 2021-12-24 08:48:50 UTC

(-23)– 15 – (-23) + 5 +(-10) .
= - 23 – 15 + 23 + 5 – 10.
= (-23 + 23) + (-15 + 5 - 10)
= 0 + ( -10 - 10 ).
= 0 + ( -20).
= 0 – 20.
= -20.

Võ Nguyễn Trường Hưng

2021-12-24 08:49:21 UTC

= -23 - 15 + 23 + 5 - 10
= (-23 + 23) + (-15 + 5 - 10)
= -10 - 10
= -20

khả Hân

vongockhahan102021 — 2021-12-24 08:49:48 UTC

(-23) – 15 – (-23) + 5 + (-10)

= - 23 – 15 + 23 + 5 – 10

= (-23 + 23) + (-15 + 5 - 10)

= 0 + ( -10 - 10 )

= 0 + ( -20)

= 0 – 20

= -20.

An Nhi

annhi2010kgvn — 2021-12-24 08:50:11 UTC

= -23 - 15 + 23 + 5 - 10
= (-23 + 23) + (-15 + 5 - 10)
= 0 + ( -10 - 10 )
= 0 + ( -20)
= 0 – 20
= -20
kết quả = 20

Thúy an

2021-12-24 08:51:11 UTC

Như Quỳnh

nguyenthinhuquynh2514 — 2021-12-24 08:51:16 UTC

(-23)-15(-23)+5+(-10)
= -23 - 15 + 23 + 5 - 10
= (-23 + 23) + (-15 + 5 - 10)
= 0 + ( -10 - 10 )
= 0 + ( -20)
= 0 – 20
= -20.

(-23)– 15 – (-23) + 5 +(-10) .= - 23 – 15 + 23 + 5 – 10.= (-23 + 23) + (-15 + 5 - 10)= 0 + ( -10 - 10 ).= 0 + ( -20).= 0 – 20.= -20. ÂN

2021-12-24 08:51:19 UTC

Thành Đạt

thanhdat2202rion — 2021-12-24 08:51:36 UTC

= -23 – 15 + 23 + 5 – 10

= (-23 + 23) + (-15 + 5 - 10)

= 0 + ( -10 - 10 )

= 0 – 20

= -20

T.Vy

2021-12-24 08:51:51 UTC

(-23)– 15 – (-23) + 5 +(-10) .

= - 23 – 15 + 23 + 5 – 10.

= (-23 + 23) + (-15 + 5 - 10)

= 0 + ( -10 - 10 ).

= 0 + ( -20).

= 0 – 20.

khánh linh

2021-12-24 08:52:17 UTC

Trần Hữu Khang

2021-12-24 08:52:21 UTC

Tiên

2021-12-24 08:56:07 UTC

Thúy an

2021-12-24 09:01:26 UTC

a) (-385 + 210) + (385 - 217)

= - 385 + 210 + 385 - 217 (bỏ ngoặc tròn)

= (- 385 + 385) – (217 – 210)

= 0 – 7

= - 7

b) (72 - 1 956) - (-1 956 + 28)

= 72 - 1 956 + 1 956 - 28 (bỏ ngoặc tròn)

= (1 956 – 1 956) + (72 – 28)

= 0 + 44

= 44

Bảo Trân

nguyenhoangbaotran0404 — 2021-12-24 09:13:02 UTC

a)(-385 + 210) + (385 - 217)
= - 385 + 210 + 385 - 217.
= (- 385 + 385) – (217 – 210) .
= 0 – 7 .
=- 7.
b) (72 - 1 956) - (-1 956 + 28).
= 72 - 1 956 + 1 956 - 28
= (1 956 – 1 956) + (72 – 28)
= 0 + 44
= 44.

An Nhi

annhi2010kgvn — 2021-12-24 09:13:08 UTC

a) (-385 + 210) + (385 - 217)

= - 385 + 210 + 385 - 217

= (- 385 + 385) – (217 – 210)

= 0 – 7

= - 7

b). (72 - 1 956) - (-1 956 + 28)

=. 72 - 1 956 + 1 956 - 28

= (1 956 – 1 956) + (72 – 28)

= 0 + 44

= 44

Võ Nguyễn Trường Hưng

2021-12-24 09:13:14 UTC

a) = -385 + 210 + 385 - 217
= (385 - 385) - (217 - 210)
= 0 - 7 = -7
b) = 72 - 1956 + 1956 - 28
= (1956 - 1956) + (72 - 28)
= 44

khả Hân

vongockhahan102021 — 2021-12-24 09:13:31 UTC

a) (-385 + 210) + (385 - 217)

= - 385 + 210 + 385 - 217

= (- 385 + 385) – (217 – 210)

= 0 – 7

= - 7
b) (72 - 1 956) - (-1 956 + 28)

= 72 - 1 956 + 1 956 - 28

= (1 956 – 1 956) + (72 – 28)

= 0 + 44

= 44

Quỳnh

nguyenthinhuquynh2514 — 2021-12-24 09:14:00 UTC

a) (-385+210)+(385-217)

= -385+210+385-217 <-bỏ dấu ngoặc tròn

= (-385+385)–(217–210)
= 0–7

= -7.

b) (72-1956)-(-1956+28)

= 72-1956+1956-28 <-bỏ dấu ngoặc tròn

= (1956–1956)+(72–28)

= 0+44

= 44.

Thành Đạt

thanhdat2202rion — 2021-12-24 09:16:08 UTC

a) (-385 + 210) + (385 - 217)

= -385 + 210 + 385 - 217

=(- 385 + 385) – (217 – 210)

= - 7

b) (72 - 1 956) - (-1956 + 28)

= 72 - 1956 + 1956 - 28

= (1956 – 1956) + (72 – 28)

= 44

2021-12-24 09:16:53 UTC

khánh linh

2021-12-24 09:17:21 UTC

Trần Hữu Khang

2021-12-24 09:17:35 UTC

2021-12-24 09:17:38 UTC

Tiên

2021-12-24 09:17:44 UTC

An Nhi

annhi2010kgvn — 2021-12-24 09:21:14 UTC

a) 12 + 13 + 14 - 15 - 16 - 17

= (12 - 15) + (13 - 16) + (14 - 17)

= (-3) + (-3) + (-3) = -9

b) (35 - 17) - (25 - 7 + 22)

= 35 - 17 - 25 + 7 - 22

= (35 - 25) - (17 - 7) - 22

= 10 - 10 - 22 = -22

Bảo Trân

nguyenhoangbaotran0404 — 2021-12-24 09:21:20 UTC

a)12 + 13 + 14 - 15 - 16 - 17
= (12 - 15) + (13 - 16) + (14 - 17) .
= (-3) + (-3) + (-3) .
= - (3 + 3 + 3).
= - 9.
b) (35 - 17) - (25 - 7 + 22).
= 35 - 17 -25 + 7 - 22.
= (35 - 25) - (17 - 7) – 22
= 10 - 10 – 22
= 0 – 22
= - 22.

Thúy an

2021-12-24 09:22:01 UTC

Thành Đạt

thanhdat2202rion — 2021-12-24 09:22:52 UTC

= (12 - 15) + (13 - 16) + (14 - 17)

= (-3) + (-3) + (-3)

= - 9

= 35 - 17 - 25 + 7 - 22

= (35 - 25) - (17 - 7) – 22

= 10 - 10 – 22

= - 22

khả Hân

vongockhahan102021 — 2021-12-24 09:23:03 UTC

a) 12 + 13 + 14 - 15 - 16 - 17

= (12 - 15) + (13 - 16) + (14 - 17)

= (-3) + (-3) + (-3)

= - (3 + 3 + 3)

= - 9
b) (35 - 17) - (25 - 7 + 22)

= 35 - 17 -25 + 7 - 22

= (35 - 25) - (17 - 7) – 22

= 10 - 10 – 22

= 0 – 22

= - 22.

Võ Nguyễn Trường Hưng

2021-12-24 09:23:49 UTC

a) = (12 - 15) + (13 - 16) + (14 - 17)
= -3 - 3 - 3
= -9
b) = 35 - 17 - 25 + 7 - 22
= (35 - 25) - (17 - 7) -22
= 10 - 10 - 22 = -22

T.Vy

2021-12-24 09:23:57 UTC

a)12 + 13 + 14 - 15 - 16 - 17

= (12 - 15) + (13 - 16) + (14 - 17) .

= (-3) + (-3) + (-3) .

= - (3 + 3 + 3).

= - 9.

b) (35 - 17) - (25 - 7 + 22).

= 35 - 17 -25 + 7 - 22.

= (35 - 25) - (17 - 7) – 22

= 10 - 10 – 22

= 0 – 22

= - 22.

Trần Hữu Khang

2021-12-24 09:24:29 UTC

khánh linh

2021-12-24 09:25:16 UTC

Thúy an

2021-12-24 09:27:02 UTC

a) (56 - 27) - (11 + 28 - 16)

= 56 - 27 - 11 - 28 + 16

= (56 + 16) – (27 + 11 + 28)

= 72 – (38 + 28)

= 72 – 66

= 6

b) 28 + (19 - 28) - (32 - 57)

= 28 + 19 – 28 – 32 + 57

= (28 – 28) + (19 + 57) – 32

= 0 + 76 – 32

= 76 - 32

= 44

An Nhi

annhi2010kgvn — 2021-12-24 09:29:06 UTC

a) ( 56 - 27 ) - ( 11 + 28 - 16 )

= 56 - 27 - 11 - 28 + 16

= 56 - ( 27 + 11 + 28 ) + 16

= 56 - 66 + 16

= -10 + 16

= 6

b) 28 + ( 19 - 28 ) - ( 32 - 57 )

= 28 + 19 - 28 - 32 + 57

=( 28 - 28 ) + 19 - 32 +57

= 0 - 13 + 57
= 44

Khả Hân

vongockhahan102021 — 2021-12-24 09:29:52 UTC

a) (56 - 27) - (11 + 28 - 16)

= 56 - 27 - 11 - 28 + 16

= (56 + 16) – (27 + 11 + 28)

= 72 – (38 + 28)

= 72 – 66

= 6

b) 28 + (19 - 28) - (32 - 57)

= 28 + 19 – 28 – 32 + 57

= (28 – 28) + (19 + 57) – 32

= 0 + 76 – 32

= 76 - 32

= 44

Thành Đạt

thanhdat2202rion — 2021-12-24 09:30:00 UTC

= 56 - 27 - 11 - 28 + 16

= (56 + 16) – (27 + 11 + 28)

= 72 – (38 + 28)

= 6

= 28 + 19 – 28 – 32 + 57

= (28 – 28) + (19 + 57) – 32

= 0 + 76 – 32

= 44

T.Mai

nguyenphamtrucmai2010 — 2021-12-24 09:32:27 UTC

a) (56-27)-(11+28-16)
=56-27-11-28+16
=(56+16)-(27+11+28)
=72-(38+28)
=72-66
=6

b) 28+(19-28)-(32-57)
=28+19-28-32+57
=(28-28)+(19+57)-32
=0+76-32
=76-32
=44
nếu thầy có dạy thêm violympic thì em cũng zô học.

N.Quỳnh

nguyenthinhuquynh2514 — 2021-12-24 09:32:32 UTC

a) (56 - 27) - (11 + 28 - 16)

= 56 - 27 - 11 - 28 + 16

= (56 + 16) – (27 + 11 + 28)

= 72 – (38 + 28)

= 72 – 66

= 6.

b) 28 + (19 - 28) - (32 - 57)

= 28 + 19 – 28 – 32 + 57

= (28 – 28) + (19 + 57) – 32
= 0 + 76 – 32

= 76 - 32

= 44.

Tuyết

2021-12-24 09:32:50 UTC

= 56 - 27 - 11 - 28 + 16

= (56 + 16) – (27 + 11 + 28)

= 72 – (38 + 28)

= 6

= 28 + 19 – 28 – 32 + 57

= (28 – 28) + (19 + 57) – 32

= 0 + 76 – 32

= 44

Bảo Trân

nguyenhoangbaotran0404 — 2021-12-24 09:33:39 UTC

a) (56 - 27) - (11 + 28 - 16).
= 56 - 27 - 11 - 28 + 16
= (56 + 16) – (27 + 11 + 28)
= 72 – (38 + 28).
= 72 – 66.
= 6.
b)28 + (19 - 28) - (32 - 57) .
= 28 + 19 – 28 – 32 + 57.
= (28 – 28) + (19 + 57) – 32.
= 0 + 76 – 32.
= 76 - 32.

= 44.

khánh linh

2021-12-24 09:33:53 UTC

Làm nãy giờ mà em quên ấn nộp:)

nguyenhoangbaotran0404 — 2021-12-24 09:34:03 UTC

2021-12-24 09:34:10 UTC

Trần Hữu Khang

2021-12-24 09:34:32 UTC

T.Vy

2021-12-24 09:35:09 UTC

a) (56 - 27) - (11 + 28 - 16)
= 56 - 27 - 11 - 28 + 16
= (56 + 16) – (27 + 11 + 28)
= 72 – (38 + 28)
= 72 – 66
= 6
b) 28 + (19 - 28) - (32 - 57)
= 28 + 19 – 28 – 32 + 57
= (28 – 28) + (19 + 57) – 32
= 0 + 76 – 32
= 76 - 32
= 44

Bảo Trân

nguyenhoangbaotran0404 — 2021-12-24 09:40:03 UTC

a) 21 - 22 + 23 - 24
= (21 - 22) + (23 - 24)
= (-1) + (-1)
= - (1 + 1).
= -2.
b) 125 - (115 - 99)
= 125 - 115 + 99
= (125 - 115) + 99
= 10 + 99
= 109.

An Nhi

annhi2010kgvn — 2021-12-24 09:40:10 UTC

a) 21 - 22 + 23 - 24

= (21 - 22) + (23 - 24)

= (-1) + (-1)
= -2

b) 125 - (115 - 99)

= 125 - 115 + 99

= (125 - 115) + 99

= 10 + 99
= 109

N.Quỳnh

nguyenthinhuquynh2514 — 2021-12-24 09:41:00 UTC

a) 21 - 22 + 23 - 24

= (21 - 22) + (23 - 24)

= (-1) + (-1)

= - (1 + 1)

= -2.

b) 125 - (115 - 99)

= 125 - 115 + 99

= (125 - 115) + 99

= 10 + 99

= 109.

Thúy an

2021-12-24 09:41:13 UTC

a) 21 - 22 + 23 - 24

= (21 - 22) + (23 - 24)

= (-1) + (-1)

= - (1 + 1)

= -2

b) 125 - (115 - 99)

= 125 - 115 + 99

= (125 - 115) + 99

= 10 + 99

= 109

Khả Hân

vongockhahan102021 — 2021-12-24 09:42:22 UTC

a) 21 - 22 + 23 - 24

= (21 - 22) + (23 - 24)

= (-1) + (-1)

= - (1 + 1)

= -2.

b) 125 - (115 - 99)

= 125 - 115 + 99

= (125 - 115) + 99

= 10 + 99

= 109.

Trần Hữu Khang

2021-12-24 09:43:00 UTC

khánh linh

2021-12-24 09:43:05 UTC

a) 21 - 22 + 23 - 24= (21 - 22) + (23 - 24)= (-1) + (-1) = -2 b) 125 - (115 - 99)= 125 - 115 + 99= (125 - 115) + 99 = 10 + 99 = 109 ân

2021-12-24 09:43:32 UTC

Thành Đạt

thanhdat2202rion — 2021-12-24 09:43:54 UTC

a) 21 - 22 + 23 - 24

= (21 - 22) + (23 - 24)

= (-1) + (-1)

= -2

b) 125 - (115 - 99)

= 125 - 115 + 99

= (125 - 115) + 99

= 109

T.Mai

nguyenphamtrucmai2010 — 2021-12-24 09:51:07 UTC

Mai Mài Mái

nguyenphamtrucmai2010 — 2021-12-24 09:53:52 UTC

nguyenphamtrucmai2010 — 2021-12-24 09:54:12 UTC

E chúc thầy noel zui zẻ ^^

2021-12-24 09:54:47 UTC