2EC
Объяснение:
АВ + СD - AC + BC - BE - CE = (AB + BC) + CA + EC + BC + EB =
AC + (EC + CA) + (EB + BC) = AC + EA + EC = (EA + AC) + EC = EC + EC = 2EC
-AC = CA
-CE = EC
-BE = EB
2EC
Объяснение:
АВ + СD - AC + BC - BE - CE = (AB + BC) + CA + EC + BC + EB =
AC + (EC + CA) + (EB + BC) = AC + EA + EC = (EA + AC) + EC = EC + EC = 2EC
-AC = CA
-CE = EC
-BE = EB