p5 Maths

42÷6/7
= 42 x 7/6
=7 x 7
=49

8/9÷2/3
=8/9 x 3/2
=4/3

3 3/8÷1 1/2
=27/8÷3/2
=27/8 x 2/3
=9/4
=2 1/4

4 1/6÷2 1/2
=25/6÷5/2
=25/6 x 2/5
=5/3
=1 2/3

5/12÷1/6
=5/12 x 6
=5/2
=2 1/2

5/63÷1 2/3
=5/63÷5/3
=5/63 x 3/5
=1/21

2 1/4÷3/4
=9/4÷3/4
=9/4 x 4/3
=3

15 2/5÷4/15
=77/5÷4/15
=77/5 x 15/4
=77 x 3/4
=231/4
=57 3/4

9 3/8÷1 1/4
=75/8÷5/4
=75/8 x 4/5
=15/2
=7 1/2

7 1/2÷1 11/14
=15/2÷25/14
=15/2 x 14/25
=3 x 7/5
=21/5
=4 1/5

ok?

42÷6/7=42×7/6=49
8/9÷2/3=8/9×3/2=4/3
3 3/8÷1 1/2=27/8×2/3=9/4
4 1/6÷2 1/2=25/6×2/5=5/3
5/12÷1/6=5/12×6=5/2
5/63÷1 2/3=5/63×3/5=1/21
2 1/4÷3/4=9/4×4/3=3
15 2/5÷4/15=77/5×15/4=231/4
9 3/8÷1 1/4=75/8×4/5=15/2
7 1/2÷1 11/14 =15/2×14/25=21/5

2007-05-23 11:00:39 補充：
將所有帶分數轉為假分數將所有除分數轉為乘之後再約簡就OK~^^

1.42÷6/7 = 42 x 7/6 = 49
2 8/9÷2/3 = 8/9 x 3/2 = 24/ 18 = 4/3 ( or 1/1/3 )
3. 3 3/8÷1 1/2 = 要上課, lunch 再補充