maths homework class 4

2015-04-13 2:15 am
1.1/3+2/5=
2.2/7+4/9=
3.5/7+5/8=
4.1/2+2/9=
5.2/5+3/4=

回答 (2)

2015-04-13 2:52 am
✔ 最佳答案
1. 1/3+2/5
=5/15+6/15
=11/15

2. 2/7+4/9
= 18/63+ 28/63
= 46/63

3. 5/7+5/8
= 40/56+ 35/56
=75/56
=1又19/56

4. 1/2+2/9
= 9/18+ 4/18
= 11/18

5. 2/5+3/4
= 8/20+ 15/20
=23/20
1又3/20
2015-04-13 2:24 am
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