(1)(4.5÷
3
8 +8)×
1
2
=(12+8)×
1
2 ,
=20×
1
2 ,
=10.
答:结果是10.
(2)66÷(8+
1
4 ),
=66÷8
1
4 ,
=66×
4
33 ,
=2.
答:这个数是2.
(3)7.2÷(1.5×80%)-(2.3+20%).
=7.2÷1.2-2.5,
=6-2.5,
=3.5.
答:差是3.5.
(1)(4.5÷
3
8 +8)×
1
2
=(12+8)×
1
2 ,
=20×
1
2 ,
=10.
答:结果是10.
(2)66÷(8+
1
4 ),
=66÷8
1
4 ,
=66×
4
33 ,
=2.
答:这个数是2.
(3)7.2÷(1.5×80%)-(2.3+20%).
=7.2÷1.2-2.5,
=6-2.5,
=3.5.
答:差是3.5.