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- 精华
- 7
- 积分
- 7744
- 经验
- 7744 点
- 威望
- 751 点
- 金钱
- 1758 ￥
- 魅力
- 1531
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GWD-1-28
Q28:
For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2.What is the sum of all the even integers between 99 and 301?
A.10,100
B.20,200
C.22,650
D.40,200
E.45,150
Answer: B
不知该怎么做，算出来老是不对，帮帮忙~ |
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