Question

So sánh 1/7 + 1/13 + 1/25 + 1/49 + 1/97 với 1/3

Answer 1

1/7+1/13+1/25+1/49+1/97<1/3

Answer 2

A = 14/98 + 7/91 + 4/100 + 2/98 + 1/97 < 14/91 + 7/91 + 4/91 + 2/91 + 1/91 = 28/91 = 84/273 < 1/3 = 91/273

Vậy A < 1/3