谢了3x+7y+z=315 4x+10y+z=420
谢了3x+7y+z=315 4x+10y+z=420
知3x+7y+z=315,4x+10y+z=420,求x+y+z=?
已知3x+7y+z=315和4x+10y+z=420,求x+y+z
已知3X+7Y+Z=6 4X+10Y+z=7 求X+Y+Z=?
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
3x+7y+z=5 ,4x+10y+z=6 ,x+y+z=
4X+Y+10Z=169 3X+Y+7Z=126 求X,Y,Z
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
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
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)