Question

ChoA=1/1.2.3+1/2.3.4+1/3.4.5+...+1/2014.2015.2016

Các bạ̣̣n giả̉̉i hộ̣̣̣̣ mìnk nké

 

Answer 1

2A = [1/1.2-1/2.3]+[1/2.3-1/3.4]+...+[1/2014.2015-1/2015.2016]

2A = 1/1.2-1/2.3+1/2.3-1/3.4+...+1/2014.2015-1/2015.2016

2A = 1/1-1/2015.2016

2A = 2015.2016-1/2015.2016

A = \(\frac{\left[2015.2016-1\right]:2}{2015.2016}=0.4999998769\)

Answer 2

ban ơi.Số́ hơi to thì phả̉i