4 3/8 * 2 2/15
6 3/7 ÷ 5/14
1 3/8 ÷8 1/4 ÷ 6/7
60人,男佔5/12
50粒波子放入40cm長,20cm闊的瓶,水位由8cm升至10cm,求每粒波子的cm3
P5 Maths (10marks)
2007-06-08 5:37 pm
回答 (5)
2007-06-08 5:56 pm
✔ 最佳答案
1.4 3/8 * 2 2/15
= 35/8* 32/15
= 7/1 * 4/3 (約簡)
= 28/3
= 9 1/3
2.
6 3/7 ÷ 5/14
= 45/7 * 14/5
= 9/1 * 2/1
= 18
3.
1 3/8 ÷8 1/4 ÷ 6/7
= 11/8÷ 33/4 ÷ 6/7
= 11/8 * 4/33 * 7/6
= 1/2 * 1/3 * 7/6
= 7/36
4
60人,男佔5/12
60 * 5/12
= 5 * 5/1 (約簡)
= 25
男人 25, 女人 35
5.
50粒波子放入40cm長,20cm闊的瓶,水位由8cm升至10cm,求每粒波子的cm3
50粒波子的體積 = 水多出了的體積
= (20*40) * (10-8)
= 800 * 2
= 1600 cm3
每粒波子體積 = 1600/50
= 32cm3
2007-06-08 7:41 pm
4 3/8 * 2 2/15
=(4*8+3)/8 * (2*15+2)/15
=35/8 * 32/15
=1120 / 120
=9 40/120
=9 1/3
6 3/7 ÷ 5/14
=(6*7+3)/7 ÷ 5/14
=45/7 ÷5/14
=45/7 * 14/5
=9*2
=18
1 3/8 ÷ 8 1/4 ÷ 6/7
=(1*8+3)/8 ÷(8*4+1)/4 ÷ 6/7
=11/8 ÷ 33/4 ÷6/7
=11/8 *4/33 * 7/6
=(1*7)/(2*3*6)
=7/36
男生的人數
= 60 * 5/12
25人
每粒波子的cm3
=40*20*(10-8) ÷50
=1600 ÷50
=32cm3
=(4*8+3)/8 * (2*15+2)/15
=35/8 * 32/15
=1120 / 120
=9 40/120
=9 1/3
6 3/7 ÷ 5/14
=(6*7+3)/7 ÷ 5/14
=45/7 ÷5/14
=45/7 * 14/5
=9*2
=18
1 3/8 ÷ 8 1/4 ÷ 6/7
=(1*8+3)/8 ÷(8*4+1)/4 ÷ 6/7
=11/8 ÷ 33/4 ÷6/7
=11/8 *4/33 * 7/6
=(1*7)/(2*3*6)
=7/36
男生的人數
= 60 * 5/12
25人
每粒波子的cm3
=40*20*(10-8) ÷50
=1600 ÷50
=32cm3
參考: 自已計的
2007-06-08 6:01 pm
1. 4 3/8 * 2 2/15
= 35/8 * 32/15
= 7/3
= 2 1/3
2. 6 3/7 ÷ 5/14
= 45/7 * 14/5
= 9 * 2
=18
3. 1 3/8 ÷ 8 1/4 ÷ 6/7
= 11/8 * 4/33 * 7/6
= 7/36
4. 60 * 5/12
= 25人
5. [ 40cm * 20cm * ( 10 - 8 )cm ] ÷ 50
= 40 * 20 * 2 cm3 ÷ 50
= 1600 cm3 ÷ 50
= 32cm3
2007-06-08 10:04:50 補充：
改正1. 4 3/8 * 2 2/15 = 35/8 * 32/15 = 28/3 = 9 1/3對不起
= 35/8 * 32/15
= 7/3
= 2 1/3
2. 6 3/7 ÷ 5/14
= 45/7 * 14/5
= 9 * 2
=18
3. 1 3/8 ÷ 8 1/4 ÷ 6/7
= 11/8 * 4/33 * 7/6
= 7/36
4. 60 * 5/12
= 25人
5. [ 40cm * 20cm * ( 10 - 8 )cm ] ÷ 50
= 40 * 20 * 2 cm3 ÷ 50
= 1600 cm3 ÷ 50
= 32cm3
2007-06-08 10:04:50 補充：
改正1. 4 3/8 * 2 2/15 = 35/8 * 32/15 = 28/3 = 9 1/3對不起
2007-06-08 5:57 pm
1.4 3/8 * 2 2/15
=35/8 * 32/15
=7/1 * 4/3
=28/3
=9 1/3
2.6 3/7 ÷ 5/14
=45/7 ÷ 5/14
=45/7 * 14/5
=9/1 * 2/1
=18
3.1 3/8 ÷ 8 1/4 ÷ 6/7
=11/8 ÷ 33/4 ÷ 6/7
=11/8 * 4/33 * 7/6
=1/1 * 2/3 * 7/3
=14/9
=1 5/9
4.60 * 5/12
=5 * 5/1
=25(人)
5.(40 * 20 * 10 - 40 * 20 * 8) ÷ 50
=1600 ÷ 50
=32(cm3)
2007-06-08 10:00:45 補充：
Corr.3.1 3/8 ÷ 8 1/4 ÷ 6/7=11/8 ÷ 33/4 ÷ 6/7=11/8 * 4/33 * 7/6=1/2 * 1/3 * 7/6=7/36
=35/8 * 32/15
=7/1 * 4/3
=28/3
=9 1/3
2.6 3/7 ÷ 5/14
=45/7 ÷ 5/14
=45/7 * 14/5
=9/1 * 2/1
=18
3.1 3/8 ÷ 8 1/4 ÷ 6/7
=11/8 ÷ 33/4 ÷ 6/7
=11/8 * 4/33 * 7/6
=1/1 * 2/3 * 7/3
=14/9
=1 5/9
4.60 * 5/12
=5 * 5/1
=25(人)
5.(40 * 20 * 10 - 40 * 20 * 8) ÷ 50
=1600 ÷ 50
=32(cm3)
2007-06-08 10:00:45 補充：
Corr.3.1 3/8 ÷ 8 1/4 ÷ 6/7=11/8 ÷ 33/4 ÷ 6/7=11/8 * 4/33 * 7/6=1/2 * 1/3 * 7/6=7/36
參考: ^_^ I am a P5 student,in maths Exam,I always get A and in class I usually get first! ^_^
2007-06-08 5:47 pm
4 3/8 X 2 2/15
= 35/8 X 32/15
= 7 X 4/3
= 28/3
6 3/7 ÷ 5/14
= 45/7 X 14/5
= 9 X 2
= 18
1 3/8 ÷ 8 1/4 ÷ 6/7
= 11/8 ÷ 33/4 X 7/6
= 11/8 X 4/33 X 7/6
= 1/2 X 1/3 X 7/6
= 7/36
60 人裏，男人人數佔了5/12
所以，男人人數
= 60 X 5/12
= 25(人)
女人人數
= 60 - 25
= 35(人)
50粒波子的總體積
= 水位「增加」的容量
= 40 X 20 X (10 - 8)
= 1600 cm³
所以，每粒波子的體積
= 1600 / 50
= 32 cm³
= 35/8 X 32/15
= 7 X 4/3
= 28/3
6 3/7 ÷ 5/14
= 45/7 X 14/5
= 9 X 2
= 18
1 3/8 ÷ 8 1/4 ÷ 6/7
= 11/8 ÷ 33/4 X 7/6
= 11/8 X 4/33 X 7/6
= 1/2 X 1/3 X 7/6
= 7/36
60 人裏，男人人數佔了5/12
所以，男人人數
= 60 X 5/12
= 25(人)
女人人數
= 60 - 25
= 35(人)
50粒波子的總體積
= 水位「增加」的容量
= 40 X 20 X (10 - 8)
= 1600 cm³
所以，每粒波子的體積
= 1600 / 50
= 32 cm³
參考: Myself~~~
收錄日期: 2021-04-13 15:15:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070608000051KK00694