數學指數問題

2007-01-09 1:10 am
a^n-2 + a^n-1 / a^n-2 = ?

回答 (3)

2007-01-09 1:41 am
✔ 最佳答案
a^n-2 + a^n-1 / a^n-2
= (a^n)(a^ -2) + (a^n)(a^ -1) / (a^n)(a^ -2)
= (a^n)(a^ -2 + a^ -1) / (a^n)(a^ -2)
= a^ -2 + a^ -1 / a^ -2
= (1/a^2 + 1/a) / (1/a^2)
= [(1+a)/a^2] x a^2
= 1+a

2007-01-08 17:43:38 補充:
對不起, 因為不能用html格式的關係, 可能會睇得比較辛苦如有需要, 可解釋
2007-01-09 1:16 am
if (a^n-2 + a^n-1) / a^n-2
then, =1+a

Hopes can help u
參考: myself
2007-01-09 1:16 am
a^n-2 + a^n-1 / a^n-2 =a^n-1


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