Номер 1224

1) –5 • (х – 7) = 0

   х – 7 = 0

   х = 0 + 7

   х = 7

2) (х + 2)х = 0

    х + 2 = 0 або х = 0

    х = 0 – 2

    х = –2

3) (х + 3) (х – 11) = 0

    х + 3 = 0 або х – 11 = 0

    х = 0 + 3      х = 0 + 11

    х = –3          х = 11

 4) (х – 2) |x + 7| = 0

     х – 2 = 0 або |x + 7| = 0

     х = 0 + 2      х + 7 = 0

     х = 2           х = 0 – 7

                       х = –7