3x+7y+z=8,2x+3y+4z=7,则x+2y+z的值为多少?
若4x=7y+5z,2x+y=z,则x:y:z的值为
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
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2x+5y+4z=15,7x+y+3z=14,则4x+y+2z的值为______.
若x:y:z=3:5:7,3x+2y-4z=9,则x+y+z的值为( )
若2x+5y-4z=0,3x+9y-7z=0,则x+y-z的值为
已知x、y、z满足2x+3y+z=48 x-2y+2z=56 3x+5y+3z=52 则x+y+z的值为多少 急
若实数x,y,z满足x+y/1=4,y+z/1=1,z+x/1=3/7,则xyz的值为多少
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
x=2,y=-3,z=3则表达式x||y+z&&y-z的值为