Question

Cho \(B=\frac{1}{5^2}+\frac{2}{5^3}+\frac{3}{5^4}+...+\frac{2014}{5^{2015}}\)

Chứng tỏ rằng : B < \(\frac{1}{16}\)

Answer 1

vậy 1/5.2 + 34/3456.23 =vgy0 nên ta có :

1/2.5 + B = 1/16 - B = 32156.097 : 35.98 + -9 -76 , suy ra  

B= >89 _980 -  -50 + 678 x 54=143.098-2014/5.2015

vậy B=78

Answer 2

Chua hoc

Hk tot,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

k nhe Nguyen Chau Tuan Kiet