Verified answer

Ответ:

1) DE; 2) DB

Объяснение:

1) (AB + CA + DC) + (BC + CD) + DE = (AB + BC + CA) + (DC + CD) + DE =

= 0 + 0 + DE = DE

2) (AB - AC) + DC = (AB + CA) + DC = (CA + AB) + DC = CB + DC =

= DC + CB = DB