Question

Aratati ca , daca   ab+ac+bd+cd=2√3 si b+c=√6 , atunci a+d= √2 + √3

Answer 1

ab + ac + bd + cd = 2√3 ⇒ a(b+c) + d(b+c) = 2√3 ⇒ (b+c) × (a+d) = 2√3 ⇒ √6 × (a+d) = 2√3 ⇒ a+d = 2√3 ÷ √6 = √2