(1)
5
6 +
3
11 +
5
11 +
1
6
= (
5
6 +
1
6 )+(
3
11 +
5
11 ) ,
=1+
8
11 ,
= 1
8
11 ;
(2)
6
7 +
1
4 -
9
14
=
24
28 +
7
28 -
18
28 ,
=
13
28 ;
(3)51.27-8.66-1.34
=51.27-(8.66+1.34),
=51.27-10,
=41.27;
(4)32.5÷(0.05×50)
=32.5÷
5
2 ,
=
65
2 ×
2
5 ,
=13;
(5)
1
2 +
1
6 +
1
12 +
1
20
= (
6
12 +
2
12 +
1
12 )+
1
20 ,
=
3
4 +
1
20 ,
=
4
5 ;
(6)
4
5 -(
2
3 -
1
2 )
=
4
5 -
1
6 ,
=
19
30 .