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![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{1}{2}\cdot\dfrac{2}{3}\cdot\dfrac{3}{4}\cdot\dfrac{4}{5}\\ =\dfrac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 1/2 x ( 3/4 + 1/4 )
= 1/2 x 1
= 1/2
Nếu như thấy thuận tiện thì cho mình 1 nhé. Thanks
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{5}\right)=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}=\frac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\frac{1}{2}x\frac{2}{3}x\frac{3}{4}x\frac{4}{5}\)
\(=\frac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}\)
\(=\frac{1.2.3.4}{2.3.4.5}\)
\(=\frac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
theo mình nghĩ là
( 112 x 115 ) x ( 113 x 114 ) x 116
sai thì cho xin lỗi nha bn
= 1/2 . 2/3 . 3/4
= 1/4