{x÷7=y÷10=z÷5 ①
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则(x+y+3z)÷(4x-y-5z)=?结果和思路!
2x+3y-4z=-7,(x-4z)÷3=(2y+3z)÷2=2,求X,Y,Z的值
4x+9y=12 3y-2z=1 7x+5z=19÷4
{5X+Y+Z①X+5Y+Z=-2②X+Y+5Z=10③
3x+7y+z=5 ,4x+10y+z=6 ,x+y+z=
若3x+7y+z=5,4x+10y+z=3,则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3x=2y=5z≠0,求(x+2y+3z)÷(x-y+z)