(-三分之二x²yz)²=?
(y²分之x)÷(yz分之x²)×(x分之yz)
已知x/3=y/4=z/6,求(xy+yz+xz)/(x²+y²+z²)
因式分解x²-y²-z²=2yz+2x+1
因式分解x²-y²-z²+2yz
单项式-八分之x²yz²的系数是多少
-2分之x²yz²的系数是
若x²-4x+y²+6y+√z-3 +13=0,求(yz)^x的值
正整数x、y、z满足x&3-y&3-z&3=3xyz,x²=0(y+z),则xy+yz+xz=()
若x/2=y/3=z/4,求(xy+yz+zx)/(x²+y²+z²)的值.
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
已知x+y+z=10,xy+xz+yz=8,求x²+y²+z²的值
已知x+y+z=2,xy+yz+zx=-5,求x²+y²+z²的值