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Dianchik2100
@Dianchik2100
August 2022
1
9
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решите 1 вариант
номер 1 (а,б)
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m11m
А)
х
=
1
2х+3 х
х≠0 х≠-1,5
х²=2х+3
х²-2х-3=0
Д=4+12=16
х₁=
2-4
=-1
2
х₂=
2+4
=3
2
Ответ: -1; 3
б)
2х+5
-
2
=
3х
х²+х х х+1
х≠0 х≠-1
2х+5
-
2
=
3х
х(х+1) х х+1
2х+5-2(х+1)=3х*х
2х+5-2х-2=3х²
-3х²+3=0
х²-1=0
(х-1)(х+1)=
х-1=0 х+1=0
х=1 х=-1 - не подходит
Ответ: 1.
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Dianchik2100
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Answers & Comments
2х+3 х
х≠0 х≠-1,5
х²=2х+3
х²-2х-3=0
Д=4+12=16
х₁=2-4=-1
2
х₂=2+4=3
2
Ответ: -1; 3
б) 2х+5 - 2 = 3х
х²+х х х+1
х≠0 х≠-1
2х+5 - 2 = 3х
х(х+1) х х+1
2х+5-2(х+1)=3х*х
2х+5-2х-2=3х²
-3х²+3=0
х²-1=0
(х-1)(х+1)=
х-1=0 х+1=0
х=1 х=-1 - не подходит
Ответ: 1.