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(a+b)(a-b)-(a-b)的二次方+2b的二次方
人气:373 ℃ 时间:2020-06-21 18:50:32
解答
(a+b)(a-b)-(a-b)²+2b²
=a²-b²-(a²+b²-2ab)+2b²
=a²-b²-a²-b²+2ab+2b²
=-2b²+2ab+2b²
=2ab
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