Răspunsuri

2014-05-09T22:02:02+03:00
P = 2L + 2l
L = 2,8dm=28cm
P = 92cm

a) 2x28cm + 2l = 92cm
56cm + 2l = 92cm
2l = 92cm - 56cm
2l = 36cm
l = 36:2 = 18cm

b) A = L x l
L = 2,8dm
l = 18cm = 1,8dm
A = 2,8dm x 1,8dm = 5,04 dm
² 
succes!

3 2 3