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(x-y/3)^2-(x+y/3)^2因式分解
人气:137 ℃ 时间:2020-02-06 02:01:24
解答
(x-y/3)^2-(x+y/3)^2
=X^2-2XY/3+Y^2/9-X^2-2XY/3-Y^2*9
=-4XY/3
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