Ответы и объяснения

2013-12-09T09:21:31+04:00
12-12,24,36,48,60,72,84,96,108,120,132,144,156,168,180,192,204
105-105,210,315,420,525,630,735,840,945,1050
700-700,1400,2100,2800,3500,4200,4900,5600