Math!

👨🏻‍🏫 學術台數學

2008-01-18 1:01 am

9.123+(9.125+0.5*1)+(9.125+0.5*2)+(9.125+0.5*3)...+(9.125=0.5*39)=?

回答 (2)

Ng

2008-01-18 1:12 am

✔ 最佳答案

9.125+(9.125+0.5*1)+(9.125+0.5*2)+(9.125+0.5*3)...+(9.125+0.5*39)

= 9.125 * 40 + 0.5 * (1+2+3+....+39)
= 365 + 0.5 * (39 * 40 / 2)
= 365 + 390
= 755

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2008-01-18 1:10 am

39.5
可以USE EXCEL TRY下!但係要係前面加=!

2008-01-17 17:11:05 補充：
係要係前面加=

參考: EXCEL

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