1. a = 23km
b = 160 hm = 16km
c = a + b + 210m = (23 + 16)km + 210m = 39km + 0,21km = 39,21km
lungimea drumului = 23 + 16 + 39,21 = 78.21km = 7821dam
2. P = l + 364cm = L + 3200mm = L + 320cm
2(l+L) = l + 364cm = L + 320cm
l+2L = 364cm
2l+L=320cm
L = 320cm - 2l
l + 2(320cm - 2l) = 364cm
l + 640cm - 2l = 364cm
640cm - l = 364cm
l = 640cm - 364cm
l = 274cm
l + 364cm = L + 320cm
l + 44cm = L
L = 44cm + 274cm
L = 318cm