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因式分解:9a2(x-y)+4b2(y-x)
人气:349 ℃ 时间:2020-04-13 19:55:14
解答
9a2(x-y)+4b2(y-x)
=9a2(x-y)-4b2(x-y)
=(x-y)(9a2-4b2
=(x-y)(3a+2b)(3a-2b).
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