latimea unui dreptunghi reprezinta 2 supra 3 din lungime aflati dimensiunile dreptunghiului daca
perimetrul sau este 390 m?
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P dreptunghi=390m
P dreptunghi=2[l+L]
⇒2[l+L]=390m
⇒l=2L/3;
⇒2L/3+L=390m/2
⇒2L/3+L=195m
⇒2L/3+3L/3=195m
⇒5L/3=195m
⇒L=3·195m/5
⇒L=3·39m⇒L=117m[lungimea dreptunghiului];
⇒l=2·117m/3
⇒l=2·39m
⇒l=78m[latimea dreptunghiului];
P dreptunghi=2[l+L]
⇒2[l+L]=390m
⇒l=2L/3;
⇒2L/3+L=390m/2
⇒2L/3+L=195m
⇒2L/3+3L/3=195m
⇒5L/3=195m
⇒L=3·195m/5
⇒L=3·39m⇒L=117m[lungimea dreptunghiului];
⇒l=2·117m/3
⇒l=2·39m
⇒l=78m[latimea dreptunghiului];
golanul:
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