2^(2n+1)+4^n=48
2×2^(2n)+(2^2)^n=48
2×2^(2n)+(2^2n)=48
3×2^(2n)=48
3×2^(2n)=3×2^4
2n=4
n=2 //:这是答案.对比底数和指数：由：3×2^(2n)=3×2^42^(2n)=2^4 2n=4 n=2