Question

18 , 19 , 20 ex. Va rog !!

Answer 1

18) .  L = 100M
P = 4 * L
P = 4 * 100 = 400 M
SARMA = 3 * 400 = 1200 M

19).  L = A
P = 4*A
4A - 3 = 1A =A
SP = P:2 = 4A :2 = 2A

20).  L - 1/3 = A
A - 1/4 = 123 * 3
4 - 1/4 = 369
SE ADUCE LA ACELASI NUMITOR COMUN
4A - 1 = 1476
3A = 1476
A = 1476 : 3
A = 492
P = 4*492
P = 1968