(1)-16+23+(-17)-(-7)
=-16+23-17+7
=-33+30
=-3;
(2)0-
1
2 -(-
3
4 )+(-
5
6 )-
2
3
=-
6
12 +
9
12 -
10
12 -
8
12
=-1
1
4 ;
(3)
2
5 ÷(-2
2
5 ) -
8
21 × (-1
3
4 ) -0.5 ÷2×
7
2
=-
1
6 +
2
3 -
1
2 ×
1
2 ×
7
2
=-
1
6 +
2
3 -
7
8
=-
3
8 ;
(4)[2
1
2 -(
7
9 -
11
12 +
1
6 )×36]÷5
=[2
1
2 -(28-33+6)]÷5
=[2
1
2 -1]÷5
=
3
2 ÷5
=
3
10 .