我有4條maths的問題(10 points)－lgzrelv的部落格

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我有4條maths的問題(10 points)

發問:

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

最佳解答:

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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