问题描述:
(2)(x-2)(x+2)-(x+1)(x-3)
(3) (ab+1)²-(ab-1)²
(4)(2x-y)²-4(x-y)(x+2y)
(3) (ab+1)²-(ab-1)²
(4)(2x-y)²-4(x-y)(x+2y)
问题解答:
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问题描述:
问题解答:
我来补答