cac ban cho minh hoi cach giai dap 1.X1-4 X6.2
2. X1-4 B5-4
3. T6-5 X6.1
4. T5/1 X6.1
5. T5/1 X6.1
6. T5.1 X6-9
7. B4-5 P8-5
8. M6.5 X9/1
9. T5/1 X9-2 nhung the nay