计算 (x-y+z)² —(x+y-z)²
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计算(x-y+z)²—(x+y-z)²计算(x-y+z)²—(x+y-z)²计算(x-y+z)²—(x+y-z)²(x-y+z)2-(x+y
计算 (x-y+z)² —(x+y-z)²
计算 (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)2-2*x*(y-z)-x2-(y-z)2-2*x*(y-z)
=-4x(y-z)=4xz-4xy