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(3x+5y)²-(5x-3y)²
人气:166 ℃ 时间:2019-09-13 19:22:44
解答
(3x+5y)²-(5x-3y)²
=[(3x+5y)+(5x-3y)][(3x+5y)-(5x-3y)]
=(8x+2y)(-2x+8y)
=-8(4x+y)(x-4y)
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