Question

решите неравенство: |5 - 0,5x| < 1

Answer 1

∈∈ -1 < 5 - 5x < 1;
-1 - 5 < - 5x < 1 - 5;
-6 < - 5x < -4;    /: -1;
4 < 5x < 6 ;  /:5;
4/5 < x < 6/5.
x∈(0,8; 1,2)