已知方程组x:y:z=2:3:4 x+y+z=18,则3x+2y+z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
已知方程组2x+3y+4z=0,3x+y-z=0.
已知方程组2x-3y-4z=0和x+y+z=0,并且z≠0,求x:y与y:z
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
x/2=y/3=z/4 x+y+z=18 求方程组解
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
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
求解三元一次方程组:{x+y/2=y+z/3=z+x/4 x+y+z=27