Ответы и объяснения

2012-11-14T16:15:50+04:00
2012-11-14T16:29:37+04:00

6(17a+13)+(13a-5)*9                                                                                                     Решение                                                                                                                      ИЗБАВЛЯЕМСЯ ОТ СКОБОК 102a+78+117a-45 , 219а+33