Решите уравнения b-(75-38)=27;(60-11)+c=90

b-(75-38)=27                            (60-11)+c=90 b=27+(75-38)                           c=90-(60-11) b=27+37                                  c=90-49 b=64                                       c=41 Проверка                                Проверка 64-(75-38)=27                          (60-11)+41=90

б+27=75-38 b+27=37 b=37+27 b=64 проверка 64-(75-38)=27 с-90=60-11 с-90=49 с=90-49 с=41 проверка (60-11)+49=90