(1)
5
6 +
3
4 -
1
3 ,
=
19
12 -
1
3 ,
=1
1
3 ;
(2)
5
6 +
4
9 +
5
9 ,
=
5
6 +(
4
9 +
5
9 ),
=
5
6 + 1,
=1
5
6 ;
(3)
1
2 +(
2
3 -
1
4 ),
=
1
2 +
5
12 ,
=
11
12 ;
(4)3-(
9
14 +
6
7 ),
=3-
21
14 ,
=1
1
2 ;
(5)
7
11 +
1
5 +
4
11 +
2
5 ,
=(
7
11 +
4
11 )+(
1
5 +
2
5 ),
=1 +
3
5 ,
=1
3
5 ;
(6)
9
10 -(
3
4 -
1
6 ),
=
9
10 -
7
12 ,
=
19
60 .