Question

M = \(\dfrac{-3}{1.4}-\dfrac{3}{4.7}-\dfrac{3}{7.10}-...-\dfrac{3}{61.64}\)

Answer 1

\(=-\left(\dfrac{1}{1}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+...+\dfrac{1}{61}-\dfrac{1}{64}\right)=-\dfrac{1}{63}\)