xy:yz:xz=10:12:15求x:y:z
xy:yz:xz=10:12:15求x:y:z
xy/x+y=12,xz/x+z=15,yz/y+z=20,求x,y,z,的值
设xyz是非零实数求|x|/x+|y|/y+|z|/z+|xy|/xy+|xz|/xz+|yz|/yz+|xyz|/xy
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
已知x+y+z=10,xy+xz+yz=8,求x方+y方+z方的值
已知x+y+z=10,xy+xz+yz=8,求x²+y²+z²的值
求方程组的正整数解:x√(yz)+y√(xz)=39-xy y√(xz)+z√(xy)=52-yz z√(xy)+x√(
x+y+z=5,xy+xz+yz=1 ,求Z的最小值和最大值
X+Y+Z=5,XY+XZ+YZ=3求Z范围
x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz
已知X+Y+Z=a,XY+YZ+XZ=b,求X*X+Y*Y+Z*Z的值
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)