Ответы и объяснения

2014-03-31T20:16:05+04:00
1) 425/100 * 16/51 = 68/51
2) 17/18 : 85/10 = 170/1530 = 17/153
3) 68/51 - 17/153 =374/306
4) 374/306 * 3/11 = 374/1122 = 1/3