x+y+z+sin(x+2y+3z)=0,求Zx偏导.
x+y+z+sin(x+2y+3z)=0,求Zx偏导.
已知x+y+z=3y=2z,y不等于0求xy+yz+zx/x的平方+y的平方+z的平方的值
已知xy/x+y=3,yz/y+z=2,zx/z+x=1,求y的值
X+Y/XY=1,Y+Z/YZ=2,Z+X/ZX=3 求X的值
已知xy:yz:zx=3:2:1,求①x:y:z ②x/yz:y/zx
已知{3x-4y-z=0 求x^2+y^2+z^2/xy+yz+2zx的值 2x+y-8=0
已知2x-y-5z=0,x-2y+2z=0,求x²+y²+z²/xy+yz+zx的值.
已知三个数x,y,z,满足xy/x+y=-2,yz/y+z=4/3,zx/z+x=-4/3,求(xyz)/(xy+yz+
若x/3=y/2=z/5,且xy+yz+zx=93,求9x*x+12y*y+2z*z的值.
已知x+y+z=1,x2+y2+z2=2,x3+y3+z3=3,求xy(x+y)+yz(y+z)+zx(z+x)的值
已知x+y分之xy=1,y+z分之yz=2,z+x分之zx=3,求x+y+z的值
已知x+2y-3z=0,2x+3y+5z=0,则x+y+zx-y+z= ___ .