Question

Un dreptunghi are aria de 26 dm patrati si latimea reprezinta 2 supra 3 din lungime. Aflati perimetrul.
Urgent!!!!!!!!!!!!

Answer 1

Pentru ce clasa se cere rezolvarea? Pentru clasa a 7-a asta este rezolvarea:
$l= \frac{2}{3} L \\ A=L\cdot \frac{2}{3} L= \frac{2}{3} L^{2} =26 \\ L^{2} =26: \frac{2}{3}=26\cdot \frac{3}{2} =39 \\ L= \sqrt{39} , l= \frac{2 \sqrt{39} }{3} \\ P=2(L+l)=2( \sqrt{39}+ \frac{2 \sqrt{39} }{3})= \frac{10 \sqrt{39} }{3}$
Daca e vorba de o clasa mai mica atunci este  o greseala numerica in text

Answer 2

   
[tex]\displaystyle l= \frac{2}{3} \times L \\ L \times l = 26 \\ --------- \\ L \times \frac{2}{3} \times L = 26 \\ \frac{2}{3} \times L^2 = 26 \\ L^2 = 26 \times \frac{3}{2} \\ L^2 = 39 \\ L = \sqrt{39} \\ l = \frac{2 \times \sqrt{39} }{3} \\ P = 2 \times (\sqrt{39}+ \frac{2 \times \sqrt{39} }{3})=\boxed{\frac{10\times \sqrt{39} }{3}}[/tex]