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c) (x + 2).(x² – 1) = (x + 2)(x – 1)(x + 1)

(x – 1).(x + 2)(x + 1) = (x + 2)(x – 1)(x + 1)

⇒ (x + 2).(x² – 1) = (x – 1).(x + 2)(x + 1)
⇒x + 2/x - 1 = ( x + 2 ).( x + 1 )/ x2 – 1

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Thao

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ta có
(3x+3)3 = 3x . 3
9x+9 != 9x
vậy quang nói sai
ta có
(3x+3)x = 3x . (x+1)
3x^2+3x = 3x^2+3x
vậy vân nói đúng

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Hải Anh

# data[].attributes.body
Thao

# data[].attributes.body
My

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Hương