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juliagracheva
@juliagracheva
July 2022
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Решите 10 класс!!! Уравнение
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AIvanova
(2х-1)(х+1)>0
2х²+2х-х-1>0
2х²+х-1>0
2х²+х-1=0
D=1-4*2*(-1)=9
x1=-1+9\2*2=2
x2=-1-9\2*2=-2,5
х принадлежит (от -бесконечности до -2,5) (от 2 до +бесконечности)
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Answers & Comments
2х²+2х-х-1>0
2х²+х-1>0
2х²+х-1=0
D=1-4*2*(-1)=9
x1=-1+9\2*2=2
x2=-1-9\2*2=-2,5
х принадлежит (от -бесконечности до -2,5) (от 2 до +бесконечности)