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un teren de forma dreptunghiulara are aria de 480m patrati .stiind ca latimea lotului reprezinta 1/5 din lungime,sa se afle perimetrul terenului

Răspuns :

Aria dreptunghi=L*l de aici rezultă 480=L*6L/5

                                                       6L^2=480*5

                                                       6L^2=    2400

                                                       L^2=400m

                                                       L= 20 m

                                                      

Aria=480 m pătrați

l=6/5*L=6L/5 = 6*20/5 =24 m

P=2l+2L =2*20+2*24 = 40+48 =88 m