Question

O valor da expressao abaixo e :
(A-1+b-1)-2 com resolucao.

Answer 1

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