1: 5/3 1 0
11/8 3/4 7/9
2: 2/3+7/9
=6/9+7/9
=13/9
1/2+4/5
=5/10+8/10
=13/10
3/4--2/3
=9/12--8/12
=1/12
13/6--11/8
=52/24--33/24
=19/24
3: 7/8--1/9--3/4
=7/8--6/8--1/9
=1/8--1/9
=1/72
6/7+2/3+1/3
=6/7+(2/3+1/3)
=6/7+1
6
= 1------
7
9/4--(3/4+2/3)
=9/4--3/4--2/3
=3/2--2/3
=5/6
4: 解設(shè)……
x--1/3=5/6
x=1/3+5/6
x=7/6
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