Помогите разобраться .
[tex]3 log _{ \frac{1}{7} } x \ \textless \ log _{ \frac{1}{7} } 9 + log _{ \frac{1}{7} } 3 [/tex]
0 < 1/7 < 1
следовательно,
x^3 < 0 => x<0
x^3 > 27 x>3
так?
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