zx=(x-y)/2+y
zx=(x-y)/2+y
已知xy:yz:zx=3:2:1,求①x:y:z ②x/yz:y/zx
x+y+z+sin(x+2y+3z)=0,求Zx偏导.
x=z-y2x+3y=2+2zx+2y+3z=14
已知x-y=5,z-y=10,X^2+Y^2+Z^2-XY-YZ-ZX
已知xy/x+y=3,yz/y+z=2,zx/z+x=1,求y的值
x+y分之xy=5,y+z分之yz=2分之7,z+x分之zx=4,则xy+yz+zx分之xyz=?
XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值
xy+yz+zx=1,求x√yz+y√zx+z√xy
逻辑表达式X&&y||zx>zx&&y)||(y>z)x&&!z||!(y&&z)
xy+yz+zx=1,x,y,z>=0
证明 (x+y+z)^2>3(xy+yz+zx)