2019-07-12 22:17
1505
0
:
1
2
3
1. 2. 3. 4. 5.
110 9 4
2 1 5
x
x+(x+1)= 1|5[10x+(x+1)] x=4, x+1=5 45
1 :
2
3
4
5
6
7
R R
1
2
3
1 1989
2 1998.2