Предмет: Алгебра, автор: medvezhonok088

помогите! завтра семестровая по алгебре! :'(

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Автор ответа: yulia280598

4)(1/2)^2х^2+3х-1=(4)^х-3
(1/2)^2х^2+3х-1=(1/2)^-2х+6
2х^2+3х-1=-2х+6
2х^2+5х-7=0
д=81
х1=1
х2=-7/2

Автор ответа: yulia280598

2) (49/16)^х+1=(4/7)^9
(4/7)^-2х-2=(4/7)^9
-2х-2=9
-2х=11
х=-11/2
х=-5,5

(3/5)^2х=(25/9)^-3
(3/5)^2х=(3/5)^6
2х=6
х=3

Автор ответа: medvezhonok088

спасибо огромное!!!

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