Question

x=1/3x5+1/5x7+1/7x9+...+1/197+199

Answer 1

  Mình cần gấp ! Cảm ơn ! 

Answer 2

sửa đề tí nhé: \(x=\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+...+\frac{1}{197.199}\)

\(x=\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{197}-\frac{1}{199}\right)\)

\(x=\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{199}\right)\)

\(x=\frac{1}{2}.\frac{196}{597}\)

\(x=\frac{98}{597}\)

Answer 3

1/2 lay o dau vay

Answer 4

Mình lấy \(\frac{1}{5-3}=\frac{1}{2}\) :D