\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\)
\(=\frac{1}{5}\)
\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}=\frac{1}{5}\)
\(\left(1-\frac{1}{2}\right)\text{ x }\left(1-\frac{1}{3}\right)\text{ x }\left(1-\frac{1}{4}\right)\text{ x }\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\text{ }\text{ x }\frac{2}{3}\text{ x }\frac{3}{4}\text{ x }\frac{4}{5}\)
\(=\frac{1}{5}\)
( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x ( 1 - 1/5 )
= \(\frac{1}{2}.\frac{2}{2}.\frac{3}{4}.\frac{4}{5}=\frac{1}{5}\)
Chúc bn hc tốt <3