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Автор - DavyJo

помогите lg(3x-7)<=lg(x+1)

Ответ

Проверено экспертом

Автор - Rechnung
lg(3x-7) leq lg(x+1)\ left { {{3x-7 textgreater  0} atop {x+1 textgreater  0}} right.\\ left { {{3x textgreater  7} atop {x textgreater  -1}} right. \\ left { {{x textgreater  2 frac{1}{3} } atop {x textgreater  -1}} right.= textgreater  x textgreater  2 frac{1}{3}\\3x-7 leq x+1\3x-x leq 1+7\2x leq 8\x leq 4\\xin(2 frac{1}{3};4]

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