一架車在5小時內完成1800km的行程, 求它的速率
(a)ｋｍ／ｈ
(b) m/s
一架車的圴速率是75km/h , 那麼
(a) 它在20分鐘內行駛的距離是多少?!
(b). 它需要多少時間來行駛50km ?!
試以最簡形式表示下列的比:
(a)650g : 1kg
(b)750cm : 1m
maths
2007-10-13 7:32 am
回答 (3)
2007-10-13 7:39 am
✔ 最佳答案
(a) 速率=1800/5 = 360km/h(b) 速率 = 1800000/(5*60*60) = 100 m/s
2 (a) 距離 = 75/60 x 20 = 25 km
(b) 所需時間 = 50/75 = 2/3 hour = 40 minutes
3(a) 650 g : 1 kg = 650 g : 1000 g
= 13:20
(b) 750 cm:1m = 750 cm : 100 cm
=15:2
2007-10-13 8:04 am
a) 速率=1800/5 = 360km/h
b) 速率 = 1800000/(5*60*60) = 100 m/s
2a) 距離 = 75/60 x 20 = 25 km
b) 所需時間 = 50/75 = 2/3 hour = 40 minutes
3a) 650 g : 1 kg = 650 g : 1000 g
= 13:20
b) 750 cm:1m = 750 cm : 100 cm
=15:2
b) 速率 = 1800000/(5*60*60) = 100 m/s
2a) 距離 = 75/60 x 20 = 25 km
b) 所需時間 = 50/75 = 2/3 hour = 40 minutes
3a) 650 g : 1 kg = 650 g : 1000 g
= 13:20
b) 750 cm:1m = 750 cm : 100 cm
=15:2
2007-10-13 7:41 am
(1)
(a) 1800/5 km/h = 360km/h
(b) 360 x 1000 / 3600 = 100m/s
(2)
(a) 75km/h x 20min / 60min/hr = 25km
(b) 50km / 75km/h = 0.67hr = 0.67 x 60 = 40 minutes
(3)
(a) 650g : 1kg = 650g : 1000g = 13 : 20
(b) 750cm : 1m = 750cm : 100cm = 15 : 2
(a) 1800/5 km/h = 360km/h
(b) 360 x 1000 / 3600 = 100m/s
(2)
(a) 75km/h x 20min / 60min/hr = 25km
(b) 50km / 75km/h = 0.67hr = 0.67 x 60 = 40 minutes
(3)
(a) 650g : 1kg = 650g : 1000g = 13 : 20
(b) 750cm : 1m = 750cm : 100cm = 15 : 2
參考: My calculation
收錄日期: 2021-04-13 18:12:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071012000051KK04438