Ответы на вопрос:
А) (x+8)(x-3)> 0 x=-8 x=3 + - + -8 3 \\\\\\\\ \\\\\\\\\\\ x∈(-∞; -8)u(3; +∞) б) 5-x > 0 x+7 - (x-5) > 0 x+7 x-5 < 0 x+7 {x≠-7 {(x-5)(x+7)< 0 (x-5)(x+7)< 0 x=5 x=-7 + - + -7 5 \\\\\\\\\\\\\ x∈(-7; 5) в) x² - 67x < 0 x(x-67)< 0 x=0 x=67 + - + 0 67 \\\\\\\\\\\\\\\ x∈(0; 67) г) x(x+3)-6 < 3(x+1) x²+3x-6-3x-3 < 0 x²-9< 0 (x-3)(x+3)< 0 x=3 x=-3 + - + -3 3 \\\\\\\\\\\\\\\\ x∈(-3; 3)
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