Question

Determinati numere naturale care verific inegalitatea 1-x>-4

Answer 1

x = ? ∈ N daca  1-x > -4

                           -x > -4-1

                           -x > -5  | *(-1)

                            x < 5  =>  x={0;1;2;3;4}

Answer 2

1-x>-4
-x>-4-1
x>5
                         
...............................