Предмет: Математика, автор: Ололололка169

1)решите уравнение -х^2+2х+3=0
2)Решите систему уравнений методом алгебраического сложения

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Автор ответа: sonyahandball

0

-х'2+2х+3=0 / :(-1)
х'2-2х-3=0
Д=2'2-4*1*(-3)=16=4'2
х1=2+4/2=3
х2=2-4/2=-1

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