(1-1/2)x(1-1/3)x(1-1/4)x.....x(1-1/2017)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
B=(1+1/2)*(1+1/3)*(1+1/4)+...+(1+1/2017)
=3/2*4/3*5/4*...*2018/2017
=3*4*5*...*2017*2018/2*3*4*...*2017=2018/2=1009
BẠN viết sai đề!
B=\(\frac{3}{2}.\frac{4}{3}.\frac{5}{4}......\frac{2018}{2017}\)
B=\(\frac{2018}{2}\)
B=1009
=\(\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}.\dfrac{4}{5}....\dfrac{2016}{2017}.\dfrac{2017}{2018}\)
\(\dfrac{1.2.3.4....2017}{2.3.4....2017.2018}\)
=\(\dfrac{1}{2018}\)
\(A=\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{2017}\right)\)
\(A=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot...\cdot\frac{2016}{2017}\)
\(A=\frac{1}{2017}\)
\(\frac{1-1}{2}.\frac{1-1}{3}.\frac{1-1}{4}......\frac{1-1}{2017}.\frac{1-1}{2018}\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}........\frac{2016}{2017}.\frac{2017}{2018}\)
\(=\frac{1}{2018}\)
\(A=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times...\times\frac{2015}{2016}\times\frac{2016}{2017}=\frac{1}{2017}\)
=1/2x2/3x3/4x...x2016/2017
=1x2x3x...x2016/2x3x4x...x2017
=1/2017
1/2017