F.2 Maths:[3^(n)+3^(n+1)]/8
回答 (2)
2011-05-28 5:59 am
✔ 最佳答案
[3^(n)+3^(n+1)]/8= [3^n + 3*3^n]/8
= 3^n * (1 + 3)/8
= 3^n * 4/8
= 3^n * 1/2
= 3^n /2
參考: Hope the solution can help you^^”
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