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求做因式分解 3x^2(x-y)^2-27(y-x)^4
人气:441 ℃ 时间:2020-03-29 05:03:38
解答
=3(x-y)^2[x^2-(x-y)^2]
=3(x-y)^2(x+x-y)(x-x+y)
=3y(x-y)^2(2x-y)
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