分数加减法
2分之1-7分之1
=7/14-2/14
=5/14
9分之7-3分之1
=7/9-3/9
=4/9
20分之7-15分之1
=21/60-4/60
=17/60
29分之7+0
=7/29
25分之19-10分之7
=38/50-35/50
=3/50
24分之11-8分之1
=11/24-3/24
=8/24
=1/3
48分之29-12分之7
=29/48-28/48
=1/48
分数加减法
2分之1-7分之1
=7/14-2/14
=5/14
9分之7-3分之1
=7/9-3/9
=4/9
20分之7-15分之1
=21/60-4/60
=17/60
29分之7+0
=7/29
25分之19-10分之7
=38/50-35/50
=3/50
24分之11-8分之1
=11/24-3/24
=8/24
=1/3
48分之29-12分之7
=29/48-28/48
=1/48