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2000kivi2000
@2000kivi2000
July 2022
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Решите неравенство (с логарифмами)
[tex]x^(4*log3(x)-2) \leq 9[/tex]
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sedinalana
Прологарифмируем по основанию 3 и применим свойство log(a)x^n=n*log(a)x
(4log(3)x -2)*log(3)x≤2
log(3)x=t
(4t-2)*t≤2
4t²-2t-2≤0
2t²-t-1≤0
D=1+8=9
t1=(1-3)/4=-0,5
t2=(1+3)/4=1
-0,5≤t≤1
-0,5≤log(3)x≤1
x≤3 U x>0
x∈(0;3]
2 votes
Thanks 1
2000kivi2000
спасибо)
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Answers & Comments
(4log(3)x -2)*log(3)x≤2
log(3)x=t
(4t-2)*t≤2
4t²-2t-2≤0
2t²-t-1≤0
D=1+8=9
t1=(1-3)/4=-0,5
t2=(1+3)/4=1
-0,5≤t≤1
-0,5≤log(3)x≤1
x≤3 U x>0
x∈(0;3]