只需一步,快速开始
2020-8-11 18:01| 发布者: admin| 查看: 58| 评论: 0
=x(x^+x-y^-Y) =X(X+Y)(X-Y)^
x^(x+1)-y(xy+x) =x^2+x-xy^2-xy =x(x+1-y^2-y)
=x(x^+x-y^-Y) =x((x-y)(x+y)+x-y) =x(x-y)(x+y+1)
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