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数学
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因式分解:x^2-y^2-3x-5y-4
人气:273 ℃ 时间:2020-03-06 21:11:27
解答
(x+y)(x-y)-4x+x-4y-y-4
=(x+y)(x-y)-4(x-y-1)+x-y
=(x+y)(x-y)²-4(x-y-1)
其实这题的-3x=-4x+x,-5y=-4y-y
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