A = 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + ... + 1/95 - 1/97 + 1/97 - 1/99
A = 1/3 - 1/99
A = 32/99
BẠN TICK CHO MÌNH NHA
A = \(\dfrac{2}{3.5}\) + \(\dfrac{2}{5.7}+\dfrac{2}{7.9}+...+\dfrac{2}{95.97}+\dfrac{2}{97.99}\)
A = \(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+...+\dfrac{1}{95}-\dfrac{1}{97}+\dfrac{1}{97}-\dfrac{1}{99}\)
A = \(\dfrac{1}{3}-\dfrac{1}{99}\)
A = \(\dfrac{32}{99}\)
Chúc bạn học tốt !
A= \(\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+...+\dfrac{2}{97.99}\)
A= \(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{97}-\dfrac{1}{99}\)
A= \(\dfrac{1}{3}-\dfrac{1}{99}\)
A= \(\dfrac{32}{99}\)
\(A=\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+...+\dfrac{2}{95.97}+\dfrac{2}{97.99}\)
\(\Rightarrow A=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{95}-\dfrac{1}{97}+\dfrac{1}{97}-\dfrac{1}{99}\)
\(\Rightarrow A=\dfrac{1}{3}-\dfrac{1}{99}\)
\(\Rightarrow A=\dfrac{32}{99}\)
