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2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 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^2)^3-6x^3(x^3+2x^2+x);(x+y+z)(x+y-z) 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 补充习题 9.计算｛x-2y+3z}{x+2y-3z}计算{x-2y+3z}{x+2y-3z} 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+2y-3z)^2+（x-2y+3z)(x+2y-3z) (x+2y+3z)-(3x+2y-z)+(2x-3y+4z) 用直式计算 计算（x+2y-3z)的平方+（x-2y+3z)(x+2y-3z) 计算①(2x+y-3z)²；②y（x+y)+(x-y)²-x²-2y². 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 计算X+2Y+3Z=10X+2Y+3Z=104X+3Y+2Z=15求x+y+z=? 计算(2x+y+z)(2x-y-z), 计算(x+2y-z)(2y+z-x) 计算(x-2y+z)(z-x-2y),