12xy(2x+3y+4z)
已知x^3+y^3-z^3=96,xyz=4,x^2+y^2+z^2-xy+xz+yz=12,则x+y-z等于
若x/3=y=z/4,且xy+xz+yz=76,求2x*x+12y*y+9z*z的值
5yz/(y+z)=6,4xy/(z+x)=3,3xy/x+y=2
(3/4x^3y^3z^3-1/3x^2y^2z+1/2xy)/1/12xy
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+
如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?
已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
已知2x+3y-5z=0,3x-2y+12z=0(z≠0),求2x*2-3xy/4x*2-12xy+9y*2
已知X:Y:Z等于3:4:5,求2XY-3XY+Z的平方除以X平方减2XY减Z平方
设x,y,z是非零实数,且x^2+4y^2+z^2-3xy=2z根号(xy),则x+y+z/2z-x的值等于?
已知2X-3Y-Z=0,X+3Y-14Z=0,X,Y,Z不全为0,求【4X的平方-5XY+Z的平方】除以【XY+YZ+Z
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y