计算(x+y-z)(z-x-y) ,(x+y-z)(z-x+y)
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计算(x+y-z)(z-x-y),(x+y-z)(z-x+y)计算(x+y-z)(z-x-y),(x+y-z)(z-x+y)计算(x+y-z)(z-x-y),(x+y-z)(z-x+y)1用多项式乘多
计算(x+y-z)(z-x-y) ,(x+y-z)(z-x+y)
计算(x+y-z)(z-x-y) ,(x+y-z)(z-x+y)
计算(x+y-z)(z-x-y) ,(x+y-z)(z-x+y)
1用多项式乘多项式 得X平方-Y平方-ZX+Z平方
2
(x+y-z)(z-x+y) (x+y-z)(x+y-z) 据平方差公式 得(x+y)平方-z的平方 得x的平方+2XY+y的平方-Z的平方
俺是用心答的
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