已知5x=3y,4z=7y,求x:y:z
已知5x=3y,4z=7y,求x:y:z
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知3X=4X,5Y=6Z求X+Y:Y+Z
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值
已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3
求下列各连比已知x:y=3:7,y:z=7:5,求x:y:z已知x:y=4:7,y:z=2:5,求x:y:z已知x:y=
1.已知x:y:z=4:5:7,求:(一)2x+3y+z/5z; (二)x+y/y+z 非常急,
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
已知3x=4y,2y=5z,试求x:y:z
已知3X+7Y+Z=6 4X+10Y+z=7 求X+Y+Z=?
已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z