3x-y=1 x+y=7 2x-5y+3z=-6
x-y-z=0 {x+y-3z=4 2x-5y+7z=21 三元一次方程解
已知xyz≠0,且x+3y+z=0,2x+3y-z=0 ,求x+2y-7z /3x+5y+z的值?
4x-3y-6z=0,x+2y-7z=0,xyz的积不等于0,求(x+y-z)/(x-y+2z)的值
1.{x+2y=4,2x+5y-2z=11,3x-5y+2z=-1
解方程组:2x-y+z=6.-3x+2y-z=-9.x+y-2z=-1求解
已知x/2=y/3=z/5,且3x+4z-2y=40,求x、y、z的值﹔详解
xy/x+y=1,yz/y+z=2,xz/x+z=3求x,y
x:y:z=7:5:3且x+y=24,求x y z值
若x,y,z满足方程租3x+7y-z=3 4x+10y-z=2 求x+y-z
已知方程组{2x-y+z=3,3x+4y-z=8,x+y-2z=-3,
若2x+5y+4z=6,3x+y-7z=-4,那么x+y-z的值是多少?
2x+3y+z=6 x-y+2z=-1 x+2y-z=5 求这个三元一次方程的解