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因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)
人气:203 ℃ 时间:2019-10-05 20:40:24
解答
(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)= (x-2y)[(x-3y)+(x-4y)]+(x-5y)[(x-4y)+(x-3y)]= (x-2y)(2x-7y)+(x-5y)(2x-7y)= (2x-7y)[(x-2y)+(x-5y)]= (2x-7y)(2x-7y)= (2x-7y)^2
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