问题描述: X^2-Y^2-Z^2=0,A是一个关于X,Y,Z的一次多项式,X^3-Y^3-Z^3=(X-Y)(X-Z)A,则A的表达式是什么? 1个回答 分类:综合 2014-12-16 问题解答: 我来补答 因为x^2-y^2-z^2=0 所以z^3=z(x^2-y^2) y^2=x^2-z^2 因为X^3-Y^3-Z^3=(X-Y)(X-Z)A 所以x^3-y^3-z(x^2-y^2)=(x-y)(x-z)A 则(x-y)(x^2+xy+y^2)-(x-y)(zx+zy)=(X-Y)(x-Z)A 所以(x-y)[x^2+(y-z)x+y^2-yz]=(X-Y)(x-Z)A (x-y)[x^2+(y-z)x+x^2-z^2-yz]=(X-Y)(x-Z)A (x-y)(x-z)(2x+y+z)=(x-y)(x-z)A 所以A=2x+y+z 展开全文阅读