Question

[nguyễn khánh chi]

A= 5/18x23 + 1/23x24 + 7/24x31 + 2/31x33 + 4/33x37 + 1/37x38 hỏi

a= bao nhiêu

Answer 1

[Kiyotaka Ayanokoji]

\(A=\frac{5}{18.23}+\frac{1}{23.24}+\frac{7}{24.31}+\frac{2}{31.33}+\frac{4}{33.37}+\frac{1}{37.38}\)

\(A=\frac{1}{18}-\frac{1}{23}+\frac{1}{23}-\frac{1}{24}+\frac{1}{24}-\frac{1}{31}+\frac{1}{31}-\frac{1}{33}+\frac{1}{33}-\frac{1}{37}+\frac{1}{37}-\frac{1}{38}\)

\(A=\frac{1}{18}-\frac{1}{38}=\frac{5}{171}\)

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