搜狗做题网Y=2W-7 5X+3Y+2Z=2 3X-4Z=4 二题4X-9Z= 17 3X+Y+15Z...
Y=2W-7 5X+3Y+2Z=2 3X-4Z=4 二题4X-9Z= 17 3X+Y+15Z...
1.已知x:y:z=4:5:7,求：（一）2x+3y+z/5z； （二）x+y/y+z 非常急,
x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少,
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
｛4x-9z=17 3x+y+15z=18 x+2y+3z=2
4X-9Z=17 3X+Y+15Z=18 X+2Y+3Z=2
{4x-9z=17{3x+y+15z=18{x+2y+3z=2
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
4x-5z=17 3x+y+15z=18 x+2y+3z=2
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z