Task/26406750
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Log₂ (2ˣ -1) *Log₂ 2(2ˣ -1) /(-1) > - 2 ;
Log₂ (2ˣ -1) *Log₂ 2(2ˣ -1) < 2 ;
Log₂ (2ˣ -1) *(Log₂ (2ˣ -1) +1 ) < 2 ; замена: t = Log₂ (2ˣ -1)
t² +t -2 < 0 ;
(t +2)(t -1) <0 ⇒ -2 < t <1;<br>- 2 < Log₂ (2ˣ -1) < 1 ;
2⁻² < 2ˣ -1 < 2¹ ; * * * 2 >1* * *
1/4 +1 < 2ˣ < 2 +1 ;<br>5/4 < 2ˣ < 3 ;
Log₂ 5/4 1* * *
ответ : x ∈ ( Log₂ 5/4 ; Log₂ 3) .