Question

Даю 60 балов сделайте пж 3 і 4​

Answer 1

$3)4<a<7\\\\4*2<2a<7*2\\\\8<2a<14\\\\8-5<2a-5<14-5\\\\3<2a<9\\\\\boxed{\frac{1}{9}<\frac{1}{2a-5} <\frac{1}{3}}\\\\\\4.1)-5<a<1\\\\-5-8<a-8<1-8\\\\\boxed{-13<a-8<-7}\\\\\\4,2)-5*3<a*3<1*3\\\\-15<3a<3\\\\-15-2<3a-2<3-2\\\\\boxed{-17<3a-2<1}$