如果x^2-4x+y^2+6y+√z+2 +13=0,求（xy)^z的值要写我懂的

如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 如果x:y=3:2,y:Z=4：2,那么x：y：Z= 如果x:y=2:3,y:z=4:3,则x:y:z= 如果x/2=y/3=z/4,求(2x-y+3z)/(x+y-z)的值 如果x/2=y/3=z/4,且x+y+z=18,那么x+y-z=? 如果x+y=2z,且x≠y,那么x/x-z+y/y-z等于多少 如果x+y=2z,且x≠y,那么x/(x-z)+y/(y-z)等于( )急 如果x+y=2z,且x≠y,那么x/x-z+y/y-z等于多少 求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z) 如果2x-y=1,4x+z=5,那么2y+z=? (x-y)^2+4z(x-y)+4z^2 化简(x+Y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z) 计算题(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z). 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z) 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) 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z}