Ответы и объяснения

  • TMG
  • хорошист
2013-03-01T16:19:33+00:00

x+12=3x                             3(x-3)=x+2(x+5)                          2x-3>5x

-2x=12                                 3x-9=x+2x+10                             2x-5x>3

x=12/-2                                 3x-x-2x=10-9                              -3x>3

x=-6                                       0=1                                                 -x>1

отв=-6                                   отв: решение нет                   x<-1

                                                                                                  отв:x< -1