5x^3+2xy^2+7y^3因式分解
人气:161 ℃ 时间:2020-01-28 00:26:40
解答
ahtlzzx,你好!
5x^3+2xy^2+7y^3
=(5x^3-5xy^2)+(7xy^2+7y^3)
=5x(x^2-y^2)+7y^2(x+y)
=5x(x+y)(x-y)+7y^2(x+y)
=(x+y)(5x^2-5xy+7y^2)
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