a) 1/(n+1)+1/(n+2)+......+1/(2n)<1
b) The number of pairs of non-negative integers (x,y) satisfying "x+2y=n" is
{ 2(n+1)+[1+(-1)^n] } /4
c) 1+1/sqrt(2)+1/sqrt(3).......+1/sqrt(n)>2[sqrt(n+1)-1]
prove the following by MI
2010-09-18 9:16 pm
回答 (1)
2010-09-28 11:30 pm
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