=(码差纤x3-y3)+(迟仿x2z-y2z)+(xz2-yz2)
=(x-y)(x2+xy+y2)+(x-y)(xz+yz)+(x-y)庆漏z2
=(x-y)(x2+y2+z2+xy+xz+yz)
=1/2*(x-y)(2x2+2y2+2z2+sxy+2xz+2zy)
=1/2*(x-y)(x2+2xy+y2+y2+2yz+z2+x2+2xz+z2)
=1/2*(x-y)[(x+y)^2+(y+z)^2+(x+z)^2]
楼上的没我分的彻底。
希望满意
检缺顷查题目
题目为x3+x2z+xz2-y3-y2z-yz2
=(液扮链x3-y3)+(x2z-y2z)+(xz2-yz2)
=(闹孙x-y)(x2+xy+y2)+(x-y)(xz+yz)+(x-y)z2
=(x-y)(x2+y2+z2+xy+xz+yz)
给分吧
题目有问题。。。。2个X2Z
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