已知1/X+2/Y+3/Z=5,3/X+2/Y+1/Z=7,求1/X+1/Y+1/Z的值
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知{x:y:z=1:2:3,x+y+z=12,求x、y、z的值
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
已知X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值
1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值
已知x/1=y/3=z/5(x不等于0),求(x+3y-z)/(x-3y+2z)的值.
已知x:y:z=1:2:3,x+y+z=24,求x,y,z
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
已知实数xyz满足x/y+z+y/z+x+z/x+y=1求x^2/y+z+y^2/z+x+z^2/x+y的值
已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
已知方程2x+2y+3z=10且x+3y+5z=1,求2z+y-x的值