Question

Найдите значение выражения (1)/(1/36+1/45)

Answer 1

$\frac{1}{ \frac{1}{36}+ \frac{1}{45} } = \frac{1}{ \frac{5}{180}+ \frac{4}{180} } =\frac{1}{ \frac{9}{180}} =1* \frac{180}{9}} =180/9=20$

Answer 2

(1)/(1/36+1/45)=1/(5/180+4/180)=1/(9/180)=1/(1/20)=20