英文數>< 10點

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1) 1/11[ ]8[ ]10/11x1/8=1/8

解︰1/11[除]8[加]10/11x1/8=1/8

2) Annie goes to the playground once every 4 days.Kelly goes to the playground once every 6 days.Simon goes to the playground once every 8 days.They all went to the playgorund on the same day which was 6February 2008.Which day will it be when three of them go to playground again on the same day??

解︰先找出他們三人去 playground 的日子的 L.C.M.。

4 = 2 x 2

6 = 2 x 3

8 = 2 x 2 x 2

L.C.M. = 2 x 2 x 2 x 3 = 24

24 日之後，他們就會在 playground 重遇，即是 30 February 2008 會再次遇見。

3) How many times of the H.C.F of 24 and 36 is their L.C.M??

http://hk.knowledge.yahoo.com/question/question?qid=7009072400926

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It should be the 1 March 2008
because the February of 2008 just have 29 days.