已知x+3y+z=11 x+y=7,则7x+10y+3z=?
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知x+3y+z=11 x+y=7,则7x+10y+3z=?
已知3X+7Y+Z=6 4X+10Y+z=7 求X+Y+Z=?
已知3x+7y+z=315和4x+10y+z=420,求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{x+3y+10z=0 则 (x+y-z)/(x-y+z)
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
已知5x=3y,4z=7y,求x:y:z
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值