Đáp án: Hằng đẳng thức ( - x - 1 ) ² = ? - Cách 1 ( -x - 1 )^2 = ( -x )^2 - 2 ( -x ) ( -1 ) + 1^2 = x^2 + 2x + 1 _________________________________ Cách 2 ( -x - 1 )^2 = [ - ( x + 1 ) ] ^2 = ( x + 1 )^2 = x^2 + 2x + 1

Quỳnh Anh Bii

5 tháng trước

Hằng đẳng thức ( - x - 1 ) ² = ?

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dungsenpai247

5 tháng trước

Cách ` 1 : `

` ( -x - 1 )^2 `

` = ( -x )^2 - 2 . ( -x ) . ( -1 ) + 1^2 `

` = x^2 + 2x + 1 `

_________________________________

Cách ` 2 : `

` ( -x - 1 )^2 `

` = [ - ( x + 1 ) ] ^2 `

` = ( x + 1 )^2 `

` = x^2 + 2x + 1 `

kiemsibede

5 tháng trước

$(-x-1)^2=[-(x+1)]^2=(x+1)^2=x^2+2x+1$

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Choose the best answer.
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Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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Hằng đẳng thức ( - x - 1 ) ² = ?

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I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

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We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

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I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.