计算. (108÷25)×(75÷18) 3.5×(20.6-16.8÷4.8) ( 3/2-5/6)×( 2/3+6/5)        3/14×[7-4÷( 2/15+2/3)].

问题描述:

计算.
(108÷25)×(75÷18)
3.5×(20.6-16.8÷4.8)
( 

3
2
-
5
6
)×( 
2
3
+
6
5
)        
3
14
×[7-4÷( 
2
15
+
2
3
)].

(1)(108÷25)×(75÷18),
=

108
25
×
75
18

=18;
(2)3.5×(20.6-16.8÷4.8),
=3.5×(20.6-3.5),
=3.5×17.1,
=59.85;
(3)(
3
2
-
5
6
)×(
2
3
+
6
5
),
=
2
3
×
28
15

=
56
45

(4)
3
14
×[7-4÷( 
2
15
+
2
3
)],
=
3
14
×[7-4÷
4
5
],
=
3
14
×[7-4×
5
4
],
=
3
14
×[7-5],
=
3
14
×2,
=
3
7