5^( 3х + 1 ) - 5^( 3х - 3 ) <= 624 <br>5^3х•( 5 - ( 1/125 )) <= 624 <br>5^3х•( 4 124/125 ) <= 624 <br>5^3х•4,992 <= 624 <br>5^3х <= 125 <br>5^3х <= 5^3 <br>3х <= 3 <br>Х <= 1 <br>Ответ ( - бесконечность; 1 ]