Question

( a+B+c) la puterea -2

Answer 1

Răspuns:

$\dislaystyle \boxed{ x^{ - n} \ = \frac{1}{ x^{n} } }$

$\displaystyle (a \ + \ b \ + c) ^{-2} = \ \frac{1}{ (a \ + \ b \ + c) ^{2} } \ = \frac{1}{ a^{2} \ + \ b^{2} \ + \ c^{2} \ + \ 2ab\ + \ 2bc \ + \ 2ac }$