Question

tính

C=\(\left(1+\frac{1}{1\cdot3}\right)\))\(\left(1+\frac{1}{2\cdot4}\right)+\left(1+\frac{1}{3\cdot5}\right)...\left(1+\frac{2}{2015\cdot2017}\right)\)

 

Answer 1

C=(1+1+1+...+1)+(1/1*3+1/2*4+1/3*5+...+1/2015*2017+1/2015*2017)

C=2015+(2/1*3+2/2*4+2/3*5+...+2/2015*2017+2/2015*2017):2

C=2015+(1-1/3+1/2-1/4+...+1/2015-1/2017+1/2015-1/2017):2

C=2015+(1+1/2-1/2016-1/2017+1/2015-1/2017)

cai nay thi ban tu tinh lay 

nho k cho minh voi nhe

Answer 2

Dương Thanh Minh lạc đề rùi

Answer 3

=(1.3+1/1.3).(2.4+1/2.4).....(2015.2017+1/2015.2017)

=(2.2/1.3).(3.3+1/2.4)....(2016.2016/2015.2017)

=(2.3.4.....2016/1.2.3...2015).(2.3.4....2016/3.4.5...2017)

=2016.(2/2017)

=Lấy máy tính bấm nhé

(^_^)

Answer 4

Bùi Tuấn Hưng=Buồi Tuấn Hưng