Ответы и объяснения

  • neci
  • хорошист
2013-09-13T14:41:41+04:00
У=7-3х                2х-3(7-3х)=1                             у=7-3х
                            2х-21+9х=1                             у=7-3*2
                           11х=1+21                                    у=1
                              х=22/11
                              х=2