1: 1/3+1/5
=5/15+3/15
=8/15
1/5+1/9
=9/45+5/45
= 14/45
1/3+1/8
=8/24+3/24
=11/24
1/3--1/5
=5/15--3/15
=2/15
1/5--1/9
=9/45--5/45
= 4/45
1/3--1/8
=8/24--3/24
=5/24
2: 1/3+3/8
=8/24+9/24
=17/24
1--2/5
=3/5
3/5--7/15
=9/15--7/15
7/4+1/7
=49/28+4/28
=53/28
3: ① 3/25
② 10/19
③ 9/10
4: ① 100+600=700
② 600--100=500
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