решите уравнение 0.3х(х+13)-2х(0.9-0.2х)=0 - №2022781

решите уравнение 0.3х(х+13)-2х(0.9-0.2х)=0
- Предмет:
  Алгебра
- Автор:
  josefinawelch
- 6 лет назад

Ответы 1

0.3х(х+13)-2х(0.9-0.2х)=0

0.3x^2+3.9x-1.8x+0.4x^2=0

0.7x^2+2.1x=0

x(0.7x+2.1)=0

x=0        0.7x+2.1=0

              0.7x=-2.1

              x=-3
- Автор:
  beauxgray
- 6 лет назад
- 0
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