Maths - 等差數列的和

2008-05-15 7:30 am
求下列各等差級數的和:

1. 2 + ......... + 98 共33項

回答 (1)

2008-05-15 7:32 am
✔ 最佳答案

= (首項 + 尾項) x 項數 / 2
= (2+98) x33 / 2
= 3300/2
= 1650//


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