已知2^x = 8^y+1,9^y = 3^x-9 ,1/3x+1/2y =

怀疑题目漏掉了括号：
2^x = 8^(y+1)= 2^(3y+1) 即x=3y+1 1式
9^y = 3^2y = 3^(x-9) 即2y=x-9 2式
1式代入2式
2y=3y+1-9 =3y-8
y=8,代入式1得x=25
1/3x+1/2y = 1/24+1/50 = 37/600