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TaNyuShKa3001
@TaNyuShKa3001
December 2021
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решите неравенство:
㏒²₂(x-1)-㏒₀,₅(x-1)>2
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MizoriesKun
0,5=1/2=2⁻¹
㏒²₂(x-1)-㏒₀,₅(x-1)>2 ОДЗ х-1>0 x>1
㏒²₂(x-1)-( -1㏒₂
(x-1))>2
㏒²₂(x-1)+ ㏒₂
(x-1)-2 > 0 замена
㏒₂(x-1)=а
а²+а-2=0
D=1+8=9
a₁=(-1+3)/2=1 ㏒₂(x-1)=1 x-1=2¹ x=3
a₂=(-1-3)/2=-2 ㏒₂(x-1)=-2 x-1=2⁻² x-1=1/4 x=1.1/4
+ - +
-----1------1,25------------3------------------
х∈(1;1,25)∪(3;+∞)
1 votes
Thanks 1
TaNyuShKa3001
спасибо))
MizoriesKun
удачи))
goodknif
0,5=1/2=2⁻¹
㏒²₂(x-1)-㏒₀,₅(x-1)>2 ОДЗ х-1>0 x>1
㏒²₂(x-1)-( -1㏒₂
(x-1))>2
㏒²₂(x-1)+ ㏒₂(x-1)-2 > 0 замена ㏒₂(x-1)=а
а²+а-2=0
D=1+8=9
a₁=(-1+3)/2=1 ㏒₂(x-1)=1 x-1=2¹ x=3
a₂=(-1-3)/2=-2 ㏒₂(x-1)=-2 x-1=2⁻² x-1=1/4 x=1.1/4
0 votes
Thanks 0
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Answers & Comments
㏒²₂(x-1)-㏒₀,₅(x-1)>2 ОДЗ х-1>0 x>1
㏒²₂(x-1)-( -1㏒₂(x-1))>2
㏒²₂(x-1)+ ㏒₂(x-1)-2 > 0 замена ㏒₂(x-1)=а
а²+а-2=0
D=1+8=9
a₁=(-1+3)/2=1 ㏒₂(x-1)=1 x-1=2¹ x=3
a₂=(-1-3)/2=-2 ㏒₂(x-1)=-2 x-1=2⁻² x-1=1/4 x=1.1/4
+ - +
-----1------1,25------------3------------------
х∈(1;1,25)∪(3;+∞)
㏒²₂(x-1)-㏒₀,₅(x-1)>2 ОДЗ х-1>0 x>1
㏒²₂(x-1)-( -1㏒₂(x-1))>2
㏒²₂(x-1)+ ㏒₂(x-1)-2 > 0 замена ㏒₂(x-1)=а
а²+а-2=0
D=1+8=9
a₁=(-1+3)/2=1 ㏒₂(x-1)=1 x-1=2¹ x=3
a₂=(-1-3)/2=-2 ㏒₂(x-1)=-2 x-1=2⁻² x-1=1/4 x=1.1/4