Question

D = 5/2.3 - 7/3.4 + 9/4.5 - 11/5.6 + ... + 101/50.51 + 102/51/52

Answer 1

Sửa đề: -103/51*52

\(D=\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{50}+\dfrac{1}{51}-\dfrac{1}{51}-\dfrac{1}{52}\)

=1/2-1/52

=26/52-1/52=25/52