已知方程组3x+7y+z=5;4x+10y+z=6,求x+y+z的值
已知方程组3x+7y+z=5;4x+10y+z=6,求x+y+z的值
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
已知方程组{2x+5y+4z=6,3x+y-7z=-4},求x+y-z的值.
已知方程组4x-3y-6z=0,x+2y-7z=0(z≠0),求x+y+3z/4x-y-5z的值
已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值
已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
已知x.y.z满足方程组x+2y-4z=0 2x+y-5z=0 求x:y:z的值
已知x,y,z满足方程组{x+y-z=6{y+z-x=2{z+x_y=0,求x,y,z的值
已知方程组3x+7y+z=3,4x+6z=4,求x+y+z=
已知方程组{3x+7y+z=3(1) 4x+10y+z=4(2)求x+y+z的值
已知;方程组 3x+7y+z=7 4x+10y+z=8 求x+y+z的值