Răspunsuri

2014-05-19T10:38:04+03:00
P=l+l+L+L=20
2l+2L=20/ :2
l+L=10

L=15l/100

l+15l/100=10  Amplificam cu 100 pt a aduce la acelasi numitor
100l+15l=1000
115l=1000
l=8.69
L=15*8.69/100
L=1.3

Aria=1.3*8.69
Aria=11.297
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