F3 Maths.?

2016-09-11 4:13 am
[2^(n+3)-6*2^n]/[2^(n-1)+2^(n+1)]

回答 (1)

2016-09-11 5:51 am
✔ 最佳答案
Sol
[2^(n+3)-6*2^n]/[2^(n-1)+2^(n+1)]
=(8*2^n-6*2^n)/[2^(n-1)*(1+2^2)]
=2*2^n/[2^(n-1)*5]
=2*2/5
=4/5


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