解方程组:3x+7y+z=31.5,4x+10y+z=42
解方程组:3x+7y+z=31.5,4x+10y+z=42
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
解方程组:2x+3y+4z=20,x+y+z=7
解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解三元一次方程组{2x+y=10,x-y+z=4,3x-y-z=0
方程组3x+7y+z=32和4x+10y+z=42求解
方程组2x+3y+4z=128 x/7=y/10=z/5的解是
解方程组 1式:3x+7y+z=3.15 2式:4x+10y+z=4.20