Răspunsuri

2014-06-03T19:22:56+03:00
L=7 dca +l => L=70 m+l
P=2(L+l)
P=2(70+l+l)
560=2(70+2l)
70+2l=560/2
2l=280-70
l=105 m
L=70+105
L=175