(4x+10y+z)-(3x+7y+z)=1.05,
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=
知3x+7y+z=315,4x+10y+z=420,求x+y+z=?
4X+Y+10Z=169 3X+Y+7Z=126 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
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
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
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
解方程组:3x+7y+z=31.5,4x+10y+z=42