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(a-b)(x-y)-(b-a)(x+y)
人气:397 ℃ 时间:2020-04-07 11:31:28
解答
(a-b)(x-y)-(b-a)(x+y),
=(a-b)(x-y)+(a-b)(x+y),
=(a-b)(x-y+x+y),
=2x(a-b).
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