2. Only one is listed here.
15,666
3.3
4. List two (should be the only solution)
or
5.72,36
6.6
7.+/-2,+/-3
8. I won't
9. As shown in the figure
10. 1:4
1 1. First time: 16 minutes. Second time: 25 minutes.
12. (1) (350 * 4 * 2+350+550+410+60 *1.5)/4 = 420 (yuan)
I won't
13. Son A 4 sheep 1 pig 2 cattle