(1)0.25 -
11
15 +
3
4 -
4
15
=
1
4 +
3
4 -(
11
15 +
4
15 ),
=1-1,
=0;
(2)6-
5
12 ÷
10
9 -
13
8
=6-
3
8 -
13
8 ,
=6-(
3
8 +
13
8 ),
=6-2,
=4;
(3)
1
5 +
4
5 ÷
16
75 ×
8
25
=
1
5 +
4
5 ÷
16
75 ×
8
25 ,
=
1
5 +
15
4 ×
8
25 ,
=
1
5 +
6
5 ,
=1
2
5 ;
(4) (
5
7 -
1
14 +
5
6 )÷
5
42
=(
5
7 -
1
14 +
5
6 )×
42
5 ,
=
5
7 ×
42
5 -
1
14 ×
42
5 +
5
6 ×
42
5 ,
=6-
3
5 +7
=12
2
5 .