Răspunsuri

2014-05-15T22:17:17+03:00
L=2/3 *L
l=2L/3

SP=l+L=1250

2L/3 +L=1250  aducem la acelasi numitor
2L+3L=3750
5L=3750
L=750
l=2*750/3= 2*250=500
1 5 1
2014-05-15T22:23:28+03:00
Fie l-latimea si L-lungimea
l=2· \frac{L}{3}
Perimetrul=1250·2=2500
Perimetrul= 2·(L+l)=2·(L+2· \frac{L}{3} )=
               =2·( \frac{3L}{3} + \frac{2L}{3} )=
               =2· \frac{5L}{3}  \frac{10L}{3}
 \frac{10L}{3} =2500 ⇒ 10L=7500 ⇒ L=750m
l=2·250=500m