List of Solved Problem in file 1 
1-1, 1-2,2-1, 1-2, 3-1, 3-2, 3-3, 4-1, 5-1, 5-2, 6-1, 6-2, 6-3, 7-1, 9-1, 9-2, 9-4, 9-5, 12-3

List of Solved Problem in file 2
Ch3: 3.1, 3.2, 3.3
Ch5: 5.1, 6.3;
Ch7: 7.1
Ch 9: 9.1, 9.3
Ch12: 12-3