赞 yuexianmanbu 幼苗
共回答了15个问题采纳率：86.7% 举报
xy(x-y)+yz(y-z)+zx(z-x)
=xy(x-y)+yz(y-z)+zx[-(x-y)-(y-z)]
=(x-y)(xy-xz)+(y-z)(yz-zx)
=(x-y)(y-z)x+(y-z)(y-x)z
=(x-y)(y-z)(x-z)
=xy(x-y)+yz(y-z)+zx[-(x-y)-(y-z)]
=(x-y)(xy-xz)+(y-z)(yz-zx)
=(x-y)(y-z)x+(y-z)(y-x)z
=(x-y)(y-z)(x-z)
1年前
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你能帮帮他们吗