一直3x+7y+z=3.154x+10y+z=4.22求x+y+z的值

一直3x+7y+z=3.154x+10y+z=4.22求x+y+z的值 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? {x+2y+3z=11,x-y+7z=10,x+3y+2z=2 已知3x+7y+z=315和4x+10y+z=420,求x+y+z 解方程组：3x+7y+z=31.5,4x+10y+z=42求 x+y+z 谢了3x+7y+z=315 4x+10y+z=4203x+7y+z=3154x+10y+z=420 已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3 已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7 X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian X=3z X+y+z=12 X+2y-2z=10 2x+z=10 x+y-z=4 3x-y-z=0 3X+2y+z=20 x+y+z=10 Y=3X