已知4x-3y-6z=0,x+2y-7z=0,且x,y,z都不为0,求(3x+2y+z)/(x+2y+3z)的值

已知4x-3y-6z=0,x+2y-7z=0,且x,y,z都不为0,求(3x+2y+z)/(x+2y+3z)的值

4x-3y-6z=0与X+2y-7z=0连力方程组解得x=3z y=2z
代入(3x+2y+z)/(x+2y+3z) 代入得(3*3z+2*2z+z)/(3z+2*2z+3z)
解得为得7/5