\(A=\dfrac{1}{15}+\dfrac{1}{35}+\dfrac{1}{65}+...+\dfrac{1}{99}=\dfrac{16}{x}\)
\(B=\dfrac{5}{6}+\dfrac{11}{12}+\dfrac{19}{20}+\dfrac{29}{30}+\dfrac{41}{42}+\dfrac{55}{56}+\dfrac{x}{16}\)\(C=\left(1-\dfrac{1}{4}\right)\times\left(1-\dfrac{1}{9}\right)\times\left(1-\dfrac{1}{16}\right)\times...\times\left(1-\dfrac{1}{100}\right)=\dfrac{22}{x}\)
m.ng giúp em với

\(B=\dfrac{5}{2x3}-\dfrac{8}{3x5}+\dfrac{11}{5x6}-\dfrac{14}{6x8}+\dfrac{18}{8x10}-\dfrac{22}{10x12}+\dfrac{25}{12x13}\)
giúp iem vs ạ :>