Решите логарифмы----

Question

Решите логарифмы----

---

Answer 1

Log3(x+y+1) = 2
log3(x+y+1) = log3(x+y+1)^2
x+y+1= x^2 + y^2 + 1 + 2xy + 2x + 2y
x^2 + y^2 + 1 + 2xy + 2x + 2y - x - y - 1 = 0
x^2 + y^2 + 2xy + x + y = 0

???