題目如下:
請算出(1+1/2)÷(1+1/3)÷(1+1/4)÷‧‧‧‧‧(1+1/99)之值
ps:1/2=2分之一
之值=算出來的答案 ...
23229863 發表於 2011-10-25 13:24 
(1+1/2)÷(1+1/3)÷(1+1/4)÷‧‧‧‧‧(1+1/99)
2 1 3 1 4 1 99 1
=( ▔▔ + ▔▔ ) ÷ ( ▔▔ + ▔▔ ) ÷ ( ▔▔ + ▔▔ ) ÷ ‧‧‧‧‧‧( ▔▔▔ + ▔▔▔ )
2 2 3 3 4 4 99 99
3 4 5 100
= ▔▔ ÷ ▔▔ ÷ ▔▔ ÷ …………… ▔▔▔▔
2 3 4 99
3 3 4 98 99
=( ▔▔ × ▔▔ × ▔▔ × …………… × ▔▔ × ▔▔▔
2 4 5 99 100
3 1
= ▔▔▔ × 3 × ▔▔▔
2 100
9 1
= ▔▔ × ▔▔▔
2 100
9
= ▔▔▔
200 |