(a²-2ab)-(a-b)²

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(a²-2ab)-(a-b)²(a²-2ab)-(a-b)²(a²-2ab)-(a-b)²(a²-2ab)-(a-b)²

(a²-2ab)-(a-b)²
(a²-2ab)-(a-b)²

(a²-2ab)-(a-b)²
(a²-2ab)-(a-b)²
=a²-2ab-a²+2ab-b²
=-b²
如果本题有什么不明白可以追问,

= a²-2ab-(a²-2ab+b²)
= -b²

给分哦