Kết quả hơi lớn bạn nhé!

A=\(\frac{1}{31}\left[\frac{31}{5}\left(9-\frac{1}{2}\right)-\frac{17}{2}\left(4+\frac{1}{5}\right)+\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{930}\right]\)

=\(\frac{1}{31}\left[\frac{31}{5}\left(\frac{18}{2}-\frac{1}{2}\right)-\frac{17}{2}\left(\frac{20}{5}+\frac{1}{5}\right)+\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{30.31}\right]\)

=\(\frac{1}{31}\left[\frac{31}{5}.\frac{17}{2}-\frac{17}{2}.\frac{21}{5}+1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{30}-\frac{1}{31}\right]\)

=\(\frac{1}{31}\left[\frac{17}{2}.\left(\frac{31}{5}-\frac{21}{5}\right)+1-\frac{1}{31}\right]\)

=\(\frac{1}{31}\left[\frac{17}{2}.\frac{10}{5}+\frac{31}{31}-\frac{1}{31}\right]\)

=\(\frac{1}{31}\left[\frac{17}{2}.2+\frac{30}{31}\right]\)

=\(\frac{1}{31}\left[17+\frac{30}{31}\right]\)

=\(\frac{1}{31}\left[\frac{527}{31}+\frac{30}{31}\right]\)

=\(\frac{1}{31}.\frac{557}{31}=\frac{557}{961}\)

A = bao nhiêu vậy bạn

good

A=\(\frac{557}{961}\) bạn nhé

Mộc nhãn mình lại cần bạn nói quá ấy

mình không đọc được mã LaTex của bạn ấy thôi

A=557/961

A = \(\frac{557}{961}\)