Răspunsuri

2014-04-30T16:39:19+03:00
 \frac{L}{l} =  \frac{8}{5 } => 5L=8l
=> L= \frac{8l}{5}
P=2(L+l)=2( \frac{8l}{5} +  \frac{5l}{5} )=2* \frac{13l}{5} =26l/5=130
=> 26l=650 => l=25 cm; L=40 cm;
=> ARIA = L*l=1000 cm2
2 3 2
2014-04-30T16:42:55+03:00
P=2x(L+l)
L+l=130:2
L+l=65
L=65:3
2x(8l+5l)=26l:5=130
=>26l=130x5=650 =>l=650:26=25
L+25=65
L=65-25
L=40
A=Lxl
A=40x25=1000 cm²