Question

Aratati ca: daca x > 0 atunci 3x > 2x

Answer 1

x > 0

3x > 2x  | ÷x (daca x > 0, nu se schimba semnul inegalitatii)

3 > 2  (Adevarat)

Answer 2

$\it 3\ \textgreater \ 2|_{ \cdot x} \Longrightarrow 3x\ \textgreater \ 2x,\ \ \forall x\ \textgreater \ 0$