AL Pure Maths (AM > GM)

BY AM>HM (A1≠A2)

(1+1/2+1/3+....+1/2n)/2n > 2n/1+2+3+...+2n

1+1/2+1/3+...+1/2n>2n/[2n(1+2n)/2]=4n/(1+2n)

∴1+1/2+1/3+....+1/2n>4n/(1+2n)




2009-10-28 17:01:12 補充：
e家明唔明啊?

HM 唔係OUT C 咩