解方程组 2x+y+z=7 x+2y+z=8 x+y+2x=9
解方程组 2x+y+z=7 x+2y+z=8 x+y+2x=9
方程组 2x+y+z=7,x+2y+z=8,x+y+2z=9 快
如何解方程组(x+2y)(x+2z)=-16,(y+2z)(y+2x)=8,(z+2x)(z+2y)=-7
解方程组:x:y:z=4:7:8,x+y+2z=54
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
x+z=y 7*x=y+z+2 x+y+z=14 解这个方程组、
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
解方程组2x+y+x=10 x+2y+z=-6 x+y+2z=8
解方程组x-2y=-9 y-z=3 2z+x=47
解方程组x+y=13,y+z=9,x+z=2
解方程组:2x+3y+4z=20,x+y+z=7
方程组X:Y:Z=4:7:8,X+Y+2Z=54 求XYZ