Question

2/2.4+2/4.6+....+2/50.52

Answer 1

\(\dfrac{2}{2.4}+\dfrac{2}{4.6}+................+\dfrac{2}{50.52}\)

\(=\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{6}+..............+\dfrac{1}{50}-\dfrac{1}{52}\)

\(=\dfrac{1}{2}-\dfrac{1}{52}=\dfrac{25}{52}\)

Answer 2

\(\dfrac{2}{2.4}+\dfrac{2}{4.6}+.....+\dfrac{2}{50.52}\)

\(=\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{6}+.....+\dfrac{1}{50}-\dfrac{1}{52}\)

\(=\dfrac{1}{2}-\dfrac{1}{52}=\dfrac{25}{52}\)

Answer 3

tự làm đi thớt bài này quá dễ rồi