Question

Aflati lungimile laturilor unui triunghi ABC cu perimetrul de 144 cm,stiind ca AB=0,5XBC si AC=0,9XBC !
P.S. ofer 50 de puncte

Answer 1

perimetrul=AB+BC+CA=144
⇒0,5BC+BC+0,9BC=144
2,4BC=144
BC=144:2,4
BC=60
⇔AB=0,5X60=30CM
⇔CA=0,9X60=54CM
VERIFICARE:30CM+54CM+60CM=144CM

Answer 2

P=AB+AC+BC
  =144CM
0,5XBC+0,9XBC+BC=144
5BC/10+9BC/10+BC=144  NUMITORUL 10
5BC+9BC+10BC=1440
24BC=1440
BC=1440/24=60
AC=0,9X60=54
AB=0,5X60=30