X:Y=5:3,y:Z=7:5,2X—Y—Z=34.解方程组
X:Y=5:3,y:Z=7:5,2X—Y—Z=34.解方程组
X:Y=5:3,X:Z=7:3,2X—Y—Z=34.解方程组
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
解方程组:x+3y=5.y-2z=5.x+z=5
x:y:z=2:3:5解方程组 2x+3y-z=16
解方程组{x:y=5:3,y:z=7:,5,2x-y-z=34
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
解方程组 2x+y-z=2 x+2y=5 x-y+2z=-7