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юлаблаб
@юлаблаб
August 2022
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2^(x+2)-2^(2-x)=15 решите пожалуйста
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gb200510
Преобразуем
4*2^x-4/2^x=15. 2^x=t (t>=0)
4t-4/t=15
4t^2-15t-4=0
t=(15+-17)/2
t=-1 (постор. )
t=16
2^x=16
x=4
1 votes
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Answers & Comments
4*2^x-4/2^x=15. 2^x=t (t>=0)
4t-4/t=15
4t^2-15t-4=0
t=(15+-17)/2
t=-1 (постор. )
t=16
2^x=16
x=4