Răspunsuri

Cel mai inteligent răspuns!
2014-04-07T21:26:36+03:00
P=2l+2L=40=>l+L=20
d²=l²+L²=>l²+L²=208
(l+L)²=20²<=>l²+L²+2lL=400
                    dar l³+L²=208   , deci 208+2lL=400=>2lL=400-208=192=>lL=96
A=lL=96cm²
2 5 2