(x-y+z)² —(x+y-z)² 计算

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(x-y+z)² —(x+y-z)² 计算

(x-y+z)² -(x+y-z)²
=[x-(y-z)]²-[x+(y-z)]²
=x²+(y-z)²-2x(y-z)-x²-(y-z)²-2x(y-z)
=-4x(y-z)
=4xz-4xy