若{3x+7y+z=63 4x+10y+z=84,求x+y+z的值

若3x+7y+z=5,4x+10y+z=3,则x+y+z=? 若{3x+7y+z=63 4x+10y+z=84,求x+y+z的值 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 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 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)}=? 若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x+3y/2004x+2004y+2004z的值. 若x,y,z满足3x+7y+z=1,4x+10y+z=2006,求分式2005x+2005y+2005z/x+3y的值. 若x,y,z满足3x+7y+z=1和4x+10y+z=200,则x+3y分之2000x+2000y+2000z的值为? (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 2x+z=10 x+y-z=4 3x-y-z=0 若x,y,z满足3x+7x+z=1,4x+10y+z=2006,求分式2005x+2005y+2005z/x+3y的值 {2x+y=10 {x-y+z=4 {3x-y-z=0