(a-b)(-a-b)化简?

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(a-b)(-a-b)化简?
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(a-b)(-a-b)化简?
(a-b)(-a-b)化简?

(a-b)(-a-b)化简?
(a-b)(-a-b)=-(a-b)(a+b)=-(a²-b²)=b²-a²

负的(a-b)平方

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