计算(-2x+3y-5z)(2x-3y+5z)和（2x－3y－5z）(2x＋3y－5z)拜托过程写详细点我要弄懂

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)] 若|x-2|+|Y+3|+|z-5|=O计算求|x|+|Y|+|z|的值 若|x-2|+|y+3|+|z-5|=0.计算x.y.z的值 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} x/2=y/3=z/5 x+3y-z/x-3y+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 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:(2x^2)^3-6x^3(x^3+2x^2+x);(x+y+z)(x+y-z) 计算（25x^2y^3z-10x^3 y^2）/5x^2y*y x:y=3:2 y:z=5:4 x+y+z=66 请教结果及计算过程 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①(2x+y-3z)²；②y（x+y)+(x-y)²-x²-2y².