(1/2)^(x^2 - 7x + 12) > 1
x^2 - 7x + 12 < log 1/2 (1)
x^2 - 7x + 12 < 0
x^2 - 7x + 12 = 0
x = 4 ; x = 3
x € (3 ; 4)
Ответ : (3 ; 4)
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