解方程组x:y:z=4:7:8 x+y+2z=54 x= y= z= 10:00之前给分
解方程组x:y:z=4:7:8 x+y+2z=54 x= y= z= 10:00之前给分
解方程组:x:y:z=4:7:8,x+y+2z=54
方程组X:Y:Z=4:7:8,X+Y+2Z=54 求XYZ
如何解方程组(x+2y)(x+2z)=-16,(y+2z)(y+2x)=8,(z+2x)(z+2y)=-7
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
解方程组:3x+7y+z=31.5,4x+10y+z=42
解方程组:2x+3y+4z=20,x+y+z=7
求方程组x:y:z=4:7:8,x+y+2z=54的解是x= y= z=
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8
方程组 2x+y+z=7,x+2y+z=8,x+y+2z=9 快