(x+y-z)²+(x-z)(z-x)计算.

问题描述:

(x+y-z)²+(x-z)(z-x)计算.

(x+y-z)²+(x-z)(z-x)计算.
=x²+y²+z²+2xy-2xz-2yz-(x²+z²-2xz)
=y²+2xy-2yz;
=y(y+2x-2z)
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