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x^2-y^2/ax-bx+ay-by等于多少?
人气:248 ℃ 时间:2020-05-07 03:14:01
解答
(x-y)/(a-b)..过程告诉我。。。(x^2-y^2)/(ax-bx+ay-by)=(x+y)(x-y)/(a-b)(x+y)=(x-y)/(a-b)
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