如果X:Y:Z=3:4:5,且2X+3Y-5Z=-14,则X= Y= Z=
如果X:Y:Z=3:4:5,且2X+3Y-5Z=-14,则X= Y= Z=
已知2x+5y+4z=15.7x+y+3z=14 则x+y+z=?
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
x/2=y/3=z/5 x+3y-z/x-3y+z
如果x:y:z=3:4:5且2x+3y-5z=-14
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
若x:y:z=3:4:5且x+y+z=24,求x、y、z的值
若X:y:Z=3:4:5,且X+Y+Z=24,求X、Y、Z的值
如果x/5=y/4=3/z,且z不等于0,求:x+y+z/3x-2y的值
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值