Some Solutions
1.1
1.2
1.3
2.1
2.2
2.4
2.5
2.6
2.8
3.1
3.2
3.3
3.4
3.5
3.6
3.7
4.1
4.2
4.3
4.4
5.1
5.2
5.3
5.4
5.5
5.6
5.7
7.5
7.6
7.8
9.1
9.2
9.3