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zelya74
@zelya74
August 2022
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4 примера на тему логорифмы = 50 баллов срочно
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MizoriesKun
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㏒₈㏒₁₄196 -㏒₇√7= ㏒₈㏒₁₄14² -㏒₇7¹/₂=㏒₈ 2 - 1/2㏒₇7=㏒₂³ 2 - 1/2㏒₇7=
= 1/3-1/2 =(2-3)/6= -1/6
㏒₍ₓ₋₁₎(х²-5х+10)=2 ОДЗ х-1>0 x>1
х²-5х+10 =(х-1)²
х²-5х+10 = х²-2х+1
х²-5х+10 -х²+2х-1=0
9-3х=0
х=3
㏒₂²x-㏒₂x-2=0 ОДЗ х>0 , замена ㏒₂x=t
t²-t-2=0
D=1+8=9 √D=3
t₁=(1+3)/2=2 ㏒₂x=2 x₁=2²=4
t₂=(1-3)/2=-1 ㏒₂x=-1 x₂=2⁻¹=1/2
√( x-5) ОДЗ х-5≥0 x ≥5
y= -------------
lg(x+1) ОДЗ х+1>0 x >-1
x∈[5;+∞)
1 votes
Thanks 1
zelya74
разве не (-1 ; 5 ] ?
MizoriesKun
начирти больше -1 и больше 5 посмотри пересечение
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Answers & Comments
Verified answer
㏒₈㏒₁₄196 -㏒₇√7= ㏒₈㏒₁₄14² -㏒₇7¹/₂=㏒₈ 2 - 1/2㏒₇7=㏒₂³ 2 - 1/2㏒₇7== 1/3-1/2 =(2-3)/6= -1/6
㏒₍ₓ₋₁₎(х²-5х+10)=2 ОДЗ х-1>0 x>1
х²-5х+10 =(х-1)²
х²-5х+10 = х²-2х+1
х²-5х+10 -х²+2х-1=0
9-3х=0
х=3
㏒₂²x-㏒₂x-2=0 ОДЗ х>0 , замена ㏒₂x=t
t²-t-2=0
D=1+8=9 √D=3
t₁=(1+3)/2=2 ㏒₂x=2 x₁=2²=4
t₂=(1-3)/2=-1 ㏒₂x=-1 x₂=2⁻¹=1/2
√( x-5) ОДЗ х-5≥0 x ≥5
y= -------------
lg(x+1) ОДЗ х+1>0 x >-1
x∈[5;+∞)