Question

qual eh o valor da expressao a+b sobre ab para a=1/3 e b=2/5??

Answer 1

$\frac{a+b}{ab} =( \frac{1}{3} + \frac{2}{5} ): ( \frac{1}{3} . \frac{2}{5} )=$

$( \frac{5+6}{15} ): \frac{2}{15} =$

$\frac{11}{15} . \frac{15}{2} = \frac{11}{2}$