2003

$s o s á n h : A = \frac{2}{60.63} + \frac{2}{63.66} + . . . . . . . . + \frac{2}{117.120} + \frac{2}{2003}$

B= $\frac{5}{40.44} + \frac{5}{44.48} + . . . . . . . . . . . . . . . + \frac{5}{76.80} + \frac{5}{80.84}$

So sánh: A =2/60*63+2/63*66+...+2/117*120+2/2003