Question

A=(1-1/2).(1-1/3).(1-1/4).(1-1/5). (....) . (1-1/2019)

các bạn ơi giúp mk vs ngày mai mk thi rồi 

 

Answer 1

\(A=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right).....\left(1-\frac{1}{2019}\right)\)

\(A=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.....\frac{2018}{2019}\)

\(A=\frac{1.2.3.....2018}{2.3.4....2019}\)

\(A=\frac{1}{2019}\)

Answer 2

\(A=\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)...\left(1-\frac{1}{2019}\right)\)

\(A=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}...\frac{2018}{2019}\)

\(A=\frac{1}{2019}\)

Bn ơi tk cho mk nha!!!!!!!!!!!

Answer 3

\(A=\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{2019}\right)\)

\(A=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot...\cdot\frac{2018}{2019}\)

\(A=\frac{1}{2019}\)

Answer 4

trả lời :

A = 1/2019