由题意得：x-8y=0,4y-1=0,8z-3x=0 x-8y=0解得x=8y 4y-1=0解得y=1/4 8z-3x=0解得z=3/8x 将y=1/4代入x=8y得：x=2 将x=2代入z=3/8x得z=3/4 所以x=2,y=1/4,z=3/4 x+y+z=2+1/4+3/4=3
