已知；4x-3y-6z=0,x+2y-7y=0(xyz不等于0),求2x+3y+6z/x+5y+7z的值

已知；4x-3y-6z=0,x+2y-7y=0(xyz不等于0),求2x+3y+6z/x+5y+7z的值
已知；4x-3y-6z=0,x+2y-7y=0(xyz不等于0),求2x+3y+6z/x+5y+7z的值

已知；4x-3y-6z=0,x+2y-7y=0(xyz不等于0),求2x+3y+6z/x+5y+7z的值
令z=1代入4x-3y-6z=0,x+2y-7y=0得
4x-3y-6=0
x+2y-7=0
y=2,x=3
代入得
(2x+3y+6z)/(x+5y+7z)=(6+6+6)/(3+10+7)=9/10