Question

AVETI POZA ATASATA LA INTREBARE, VA ROG MULT!

EX 1/ SUBIECTUL 2

Answer 1

$D\ mijloc\ AB\implies DB=\cfrac{1}{2}AB$

$E\ mijloc\ BC\implies BE=\cfrac{1}{2}BC$

$DE=DB+BE=\cfrac{1}{2}AB+\cfrac{1}{2}BC=\cfrac{1}{2}(AB+BC)=\cfrac{1}{2}AC$

$\implies\cfrac{DE}{AC}=\cfrac{\cfrac{1}{2}AC}{AC}=\cfrac{1}{2}$

Deci raspunsul corect este c).