计算：1.(-x+2y+3z)(x-2y-3z) 2.[(x/2+3y)^2-(y/2+x)^2+(3x-2/y)^2-(x/2+3y)(3y-y/2)]÷x/2

2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y) 计算（x-y-z)^2 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+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z)计算(X+3Y+2X)(-X-3y-2Z) 计算：3x-2y- [-4x+(z+3y)] 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 (x+2y-z)(x-2y-z)计算过程 计算：(x+2y-z)(x-2y+z) 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 补充习题 9.计算｛x-2y+3z}{x+2y-3z}计算{x-2y+3z}{x+2y-3z} 计算（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)