Question

Va rog sa ma ajutati
DAU COROANA

Answer 1

P = 2(L+l)
=> 2(L+l) = 240 /:2
=> L+l = 120
=> L+$\frac{3}{5}$ L = 120
=> $\frac{5L+3L}{5}$ = 120
=> $\frac{8L}{5}$ = 120
=> L = $\frac{120 * 5}{8}$
=> L = 75

=> l = $\frac{3}{5}$ * 75 = 45

Answer 2

P=240m
l=3/5(L)...= ...l=240:2):(3/5+5/5)
.................................................
L=? l=?

L+l=240:2
L+l=120m
l=3/5(L)
L=5/5
3/5+5/5=8/5=120
l=120:8*3
l=15*3
l=45cm
L=120:8*5
L=15*5
L=75cm

verificare

P=2*(45+75)
P=2*120
P=240cm