Question

[Dương Xuân Ngân]

tìm y

[ 1/1.3+1/3.5+1/5.7+1/7.9 ] . y = 2/3

Answer 1

[Dương Xuân Ngân]

giúp mình với

Answer 2

[Võ Đông Anh Tuấn]

\(\left[\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}\right].y=\frac{2}{3}\)

\(\Leftrightarrow\left[\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}\right].y=\frac{2}{3}\)

\(\Leftrightarrow\left[\frac{1}{1}-\frac{1}{9}\right].y=\frac{2}{3}\)

\(\Leftrightarrow\frac{8}{9}.y=\frac{2}{3}\)

\(\Leftrightarrow y=\frac{2}{3}:\frac{8}{9}\)

\(\Leftrightarrow y=\frac{3}{4}\)