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Автор - adelka2015

решите уравнение:
(0,8 - 4х)(5х + 5,5) = 0

Ответ

Автор - emil112011
(0.8-4х)(5х+5.5)=0
(0.8+5.5)(-4х+5х)=0
6.3+х=0
х=6.3

Ответ

Автор - Solнышко
(0,8 - 4х)(5х + 5,5) = 0
(0,8 - 4х)=0  и  (5х + 5,5) = 0
4х = 0,8           5х = -5,5
х = 0,2       или       х = -1,1

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