數學題...趕

2007-04-08 7:59 pm
一艘輪船以24km/h 的速率行2又4份1小時後, 再以18km/h的速率行1又2份1小時. 輪船行的總距離是多少?

回答 (7)

2007-04-08 8:18 pm
✔ 最佳答案
24x2又4份1+18x1又2份1
=54+18x1又2份1
=54+27
=81(公里)
所以輪船行的總距離是81公里

驗算:
24x2又4份1
=24x2+24/4
=48+6
=54


18x1又2份1
=18x1+18/2
=18+9
=27

54+27
=81(公里)
2007-04-09 6:47 pm
輪船行的總距離是81km
2007-04-08 10:27 pm
距離=速率*時間
d=24*(9/4)+18*(3/2)
d=81km
參考: by myself
2007-04-08 8:37 pm
Answer is 81km
2007-04-08 8:36 pm
24km/hr X 2.25hr + 18km/hr X 1.5hr = 81km

留意km/hr x hr 後, 單位變了km
2007-04-08 8:21 pm
是81km
2007-04-08 8:05 pm
總距離 = 24 x (2 1/4) + 18 x (1 1/2) = 81 km

p.s. (2 1/4) = 2又4份1
  (1 1/2) = 1又2份1
參考: me =]


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