Question

Answer 1

\(=\left(\dfrac{9}{10}+\dfrac{1}{10}\right)+\left(\dfrac{7}{9}+\dfrac{2}{9}\right)+\left(\dfrac{5}{8}+\dfrac{3}{8}\right)+\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\\ =1+1+1+1=4\)

Answer 2

\(=\left(\dfrac{9}{10}+\dfrac{1}{10}\right)+\left(\dfrac{7}{9}+\dfrac{2}{9}\right)+\left(\dfrac{5}{8}+\dfrac{3}{8}\right)+\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\\ =1+1+1+1+1\\ =5\)