Fara ce spune acel baiat va raog frumos

Răspuns:
Explicație pas cu pas:
L=2l
P = 2(L+l) sau 2L+2l
300 = 2*(2l+l),
300= 6*l deci l =50
L=50*2=100
[tex]\it \ell<L\ de\ 2\ ori \Rightarrow L>\ell\ de\ 2\ ori \Rightarrow L=2\ell\ \ \ \ (1)\\ \\ 2L+2\ell=300|_{:2} \Rightarrow L+\ell=150 \stackrel{(1)}{\Longrightarrow}\ 2\ell+\ell=150 \Rightarrow 3\ell=150|_{:3} \Rightarrow\\ \\ \Rightarrow \ell=50\ cm\ \ \ \ (2)\\ \\ \\ (1),(2)\Rightarrow L=2\cdot50 \Rightarrow L=100\ cm[/tex]