已知3x+7y+z=6.3,4x+10y+z=8.4,那么x+y+z的值为?
已知3x+7y+z=6.3,4x+10y+z=8.4,那么x+y+z的值为?
已知4X=7Y+5Z,2X+Y=Z,那么X:Y:Z的值是?
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
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
已知4x-3y-6z=0,x+2y-7z=0,且x、y、z都不为0,求(3x+2y+z)/(x+2y+3z)的值 快帮求
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知2x=3y=4z求2x-y+z分之x+y+z的值
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值