1.Alice had a box of sweets.She gave 3/10of them to Bobby and 5/7 of the remaining sweets to Mabel.What fraction of the original box of sweet was left?
2.I finish 1/4 of my homework before lunch and 1/5 of it after lunch. What fraction of my homework was left not finish ?
Thank you!!*3*
english Math要列「色」
2008-03-19 7:38 pm
回答 (2)
2008-03-19 7:51 pm
1. 1- 3/10 - (1 - 3/10)x5/7
=7/10- (7/10 x 5/7)
=7/10 - 5/10
=2/10
2. 1-1/4-1/5
=1- 5/20 - 4/20
=11/20
=7/10- (7/10 x 5/7)
=7/10 - 5/10
=2/10
2. 1-1/4-1/5
=1- 5/20 - 4/20
=11/20
2008-03-19 7:48 pm
1. (1-3/10)x (1-5/7)=2/10=1/5
2. 1-(1/4+1/5)=1-9/20=11/20
2. 1-(1/4+1/5)=1-9/20=11/20
收錄日期: 2021-04-13 15:18:31
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https://hk.answers.yahoo.com/question/index?qid=20080319000051KK00789