13 |
17 |
13 |
17 |
13 |
17 |
13 |
17 |
(2)
20013−2×20012−1999 |
20013+20012−2002 |
20012(2001−2)−1999 |
20012(2001+1)−2002 |
(20012−1)1999 |
(20012−1)2002 |
1999 |
2002 |
13 |
17 |
13 |
17 |
20013−2×20012−1999 |
20013+20012−2002 |
13 |
17 |
13 |
17 |
13 |
17 |
13 |
17 |
20013−2×20012−1999 |
20013+20012−2002 |
20012(2001−2)−1999 |
20012(2001+1)−2002 |
(20012−1)1999 |
(20012−1)2002 |
1999 |
2002 |