а) (x+8)(x-3)>0x=-8 x=3 + - +------- -8 --------- 3 -----------\\\\\\\\ \\\\\\\\\\\x∈(-∞; -8)U(3; +∞)б)
5-x >0 x+7-
(x-5) >0 x+7
x-5 <0x+7{x≠-7{(x-5)(x+7)<0(x-5)(x+7)<0x=5 x=-7 + - + --------- -7 ----------- 5 ------------ \\\\\\\\\\\\\x∈(-7; 5)в) x² - 67x <0x(x-67)<0x=0 x=67 + - +---------- 0 ------------ 67 -------------- \\\\\\\\\\\\\\\x∈(0; 67)г) x(x+3)-6 < 3(x+1)x²+3x-6-3x-3 <0x²-9<0(x-3)(x+3)<0x=3 x=-3 + - +----------- -3 ------------- 3 ------------------- \\\\\\\\\\\\\\\\x∈(-3; 3)