MAths 問題....S.2的

2007-09-08 5:26 pm

1.it takes the moon 27days 7hours and 43mins to make a complete revolution around the Earth. try to change the unit of the time to

A.days and correct the answer to 4 significant figures.<----取頭4個數字
b. hours and correct the answer to 3 significant figures..

2.
1km2次方=???m
1km=???m

回答 (1)

b031c9

2007-09-08 6:23 pm

✔ 最佳答案

1a.27days 7hours and 43mins
=27days 7hours 43/60hours(about 0.717hours)
=27days 7.717/24 days(about 0.322days)
=27.322days
=27.32days(correct to 4 sig. fig.)

1b.27days 7hours and 43mins
=648hours 7hours and about 0.717hours
=655.717hours
=656hours(correct to 4 sig. fig.)

2.1km=1000m
1km2=1000m2
=1000m*1000m
=1000000m

參考: Q1 from exploring mathematics 2A

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