1.(x-2)(x+2)-(x+1)(x-3)

1.(x-2)(x+2)-(x+1)(x-3)
2.(ab+1)^2-(ab-1)^2
3.(2x-y)^2-4(x-y)(x+2y)
liming66481 1年前 已收到1个回答 举报
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1.(x-2)(x+2)-(x+1)(x-3)
=(x^2-4)-(x^2-2x-3)
=2x-1
2.(ab+1)^2-(ab-1)^2
=(ab+1+ab-1)(ab+1-ab+1)
=2ab
3.(2x-y)^2-4(x-y)(x+2y)
=(4x^2-4xy+y^2)-(4x^2+4xy-8y^2)
=9y^2-8xy

1年前

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