用两种方法计算（x+y+z)(x-y-z)
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用两种方法计算（x+y+z)(x-y-z)
计算（x+y-z)(x-y-z)
计算：(x-y+z)(-x+y+z)
用乘法公式计算(x+y)(x-y)+(-y-z)(-y+z)+(-x+z)(z+x)
计算：（X+y+z)(-x+y+z)(x-y+z)(x+y-z)
计算(x+y+z)(-x+y+z)(x-y+z)(x+y-z)
计算(x+y-z)(z-x-y) ,(x+y-z)(z-x+y)
计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y)
计算:(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)
计算（x-y-z)^2
计算(X+Y+Z)平方
计算(2x+y+z)(2x-y-z),
计算(x+2y-z)(2y+z-x)
计算(x-2y+z)(z-x-2y),
(x一2y+z)(-x+2y+z)(计算)
计算:(x+2y-z)(x-2y-z)
计算(x+2y-z)(2y+z-x)
计算：(x-y-z)^2-(x-y+z)^2