3分之2+11分之3,
=22/33+9/33
=31/33
3+9分之4,
=3又4/9
5分之4-7分之5,
=28/35-25/35
=3/35
1+11分之8,
=1又8/11
9分之8-18分之11
=16/18-11/18
=5/18
分析:
3分之2+11分之3,
=22/33+9/33
=31/33
3+9分之4,
=3又4/9
5分之4-7分之5,
=28/35-25/35
=3/35
1+11分之8,
=1又8/11
9分之8-18分之11
=16/18-11/18
=5/18