Question

CMR :

\(A=\dfrac{1}{3}+\dfrac{1}{4}+....+\dfrac{1}{32}>2\)

E đg cần gấp lắm ạ; Mong mấy ah cj ; giải dùm ạ !!!!!!!!!!

Mơn

Answer 1

B= 1/3+1/4>1/4+1/4=1/2

C= 1/5+1/6+1/7+1/8>1/8+1/8+1/8+1/8=4/8=1/2

D= 1/9+1/10+1/11+...+1/16>1/16+1/16+...+1/16=8/16=1/2

E= 1/17+1/18+...+1/32>1/32+1/32+...1/32=16/32=1/2

vậy A=B+C+D+E>1/2+1/2+1/2+1/2=2

A>2