a²(x-y)³-b(y-x)²=?求各位大哥大姐帮我解答,人都去哪里了,求求我啊.

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a²(x-y)³-b(y-x)²=?求各位大哥大姐帮我解答,人都去哪里了,求求我啊.

a²(x-y)³-b(y-x)²=?求各位大哥大姐帮我解答,人都去哪里了,求求我啊.
a²(x-y)³-b(y-x)²=?
求各位大哥大姐帮我解答,人都去哪里了,求求我啊.

a²(x-y)³-b(y-x)²=?求各位大哥大姐帮我解答,人都去哪里了,求求我啊.
a²(x-y)³-b(y-x)²)=(x-y)²(a²x-a²y-b).