我有4條maths的問題(10 points)

張希朗

2007-08-05 8:12 am

我想問...
1.
5 mins =200 km
so, 1s =? km

2.
2 hours =50 km
so, 1s=? km

3.
10 days =8000 km
so, 1s=?km

4.
20 年=70000000km
so, 1s=? km

所有問題都要詳細解釋

回答 (1)

用戶82723

2007-08-05 8:24 am

✔ 最佳答案

1.
5 mins = 200 km
5 x 60s = 200km
300s = 200km
1s = 200/300 km = 2/3 km

2.
2 hours = 50 km
2 x 60mins = 50km
2 x 60 x 60s = 50km
7200s = 50km
1s = 50/7200 km = 1/144 km

3.
10 days = 8000 km
10 x 24hours = 8000km
10 x 24 x 60mins = 8000km
10 x 24 x 60 x 60s = 8000km
10 x 86400s = 8000km
1s = 8000/864000 km = 1/108 km

4. In 20 years, there will be 5 years with 366 days.
20 years=70000000km
15 x 365 days + 5 x 366 days = 70000000km

From (3), we find 1day = 86400s.
15 x 365 x 86400s + 5 x 366 x 86400s = 70000000
63115200s = 70000000km
1s = 70000000/63115200 km = 4375/39447 km

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