3道因式分解,1.2x^3-x^2-2x+12.x^2-9y^2-2x+6y3.x^3-y^3+x^

发布时间：2021-02-22 05:47:13

3道因式分解,1.2x^3-x^2-2x+12.x^2-9y^2-2x+6y3.x^3-y^3+x^2y-xy^2

网友回答

1.2x^3-x^2-2x+1=2x(x^2-1)-(x^2-1)=(x-1)(x+1)(2x-1)
2.x^2-9y^2-2x+6y
=x^2-2x+1-9y^2+6y-1=(x-1)^2-(3y-1)^2=(x+3y-2)(x-3y)3.x^3-y^3+x^2y-xy^2
=x^2(x+y)-y^2(x+y)=(x-y)(x+y)^2
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