Упростите выражение!!!!

Question

Упростите выражение!!!!

---

Answer 1

2m^2 + 2mn + 2n^2 - 2mn - 2m^2 - 2n^2 = 0
Ответ: 0

Answer 2

2m^2+2mn-2mn+2n^2-2m^2-2n^2=0