设x再提高悬赏..
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/16 03:02:29
设x
再提高悬赏..
再提高悬赏..
(x^2+y^2)(x-y)-(x^2-y^2)(x+y)
=x³+xy²-x²y-y³-(x³+x²y-xy²-y³)
=2xy²-2x²y
=2xy(y-x)
因为x
=x³+xy²-x²y-y³-(x³+x²y-xy²-y³)
=2xy²-2x²y
=2xy(y-x)
因为x