請斆(要講解)要快

1. 2/40 = 1/20
2. 45/50 = 9/10
3. 10/12 = 5/6

2006-11-02 12:52:13 補充：
1. 2 pupils absent / 40 total pupils in class = 1/202. $45 buy a present / $50 Total money that Tom has = 9/103. (12 eggs - 1 broken egg - 1 urned bad egg) / 12 eggs (a dozen eggs) = (12 - 2) /12 = 5/6

2006-11-03 00:30:46 補充：
1. Fraction of the class was absent = 2 pupils absent / 40 total pupils in class = 1/202. Fraction of her money did Tom spend on the present = $45 buy a present / $50 Total money that Tom has = 9/10

2006-11-03 00:31:09 補充：
3. Fraction of the eggs could still be sold = (12 total eggs - 1 broken egg - 1 urned bad egg) remain good eggs/ 12 eggs (a dozen eggs) = (12 - 2) remain good eggs /12 eggs (a dozen eggs) = 10 remain good eggs / 12 eggs (a dozen eggs) = 5/6

1. 2/40=1/20 ( Because 40 pupils is the original class, then 2 were absent , this 2 are in a part of 40 pupils, so 40 should put at the bottom)
2. 45/50=9/10 (Because $45 of $50 is spent for buying the present, so 45 should put at the top)
3. 12-1-1/12=10/12=5/6 (Because only 10 eggs of the total[12] are good , they can be sold,so 10 of 12 ,10 should be put at the top)

1) 一班有40學生,今日有2人缺席,缺席人數佔班中份數多少?
2/40 = 1/20

2) 森有50元,他用45元買禮物 (gift)比父親, 買禮物佔多少份數?
45/50 = 9/10

3) 一打雞蛋,發現一只被打破,一只變壞,有多少雞蛋可以出售?多少份數?
2/12 = 1/6

2006-11-02 12:56:39 補充：
Sorry, 打錯,3) 一打雞蛋,發現一只被打破,一只變壞,有多少雞蛋可以出售?多少份數?10-2/12 = 5/6 (最後約數)