Question

$frac{a^{2}- b^{2} }{ab} : ( frac{1}{b} - frac{1}{a})$
при a = $1 frac{1}{11}$
b = $8 frac{10}{11}$

Answer 1

=((a-b)*(a+b)) / ab  : (a-b) /ab=(((a-b)*(a+b)) / ab )  *  (ab) / (a-b)=a+b  
a+b=12/1 + 98/11 =110/11= 10