= 1/1 - 1/ 2+ 1/2 - 1/3+ 1/ 3- .............+ 1/99- 1/100
= 1-1/100=99/100
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S= 1/(1x2) + 1/(2x3) +........+ 1/(99x100)
1/1x2 +1/2x3 +1/3x4+…+1/99x100
1/1x2 + 1/2x3 + 1/3x4 + ... + 1/99x100 + 1/100x101 = ...
A= 1/1x2+ 1/2x3 + 1/3x4 +............+ 1/99x100 và 1
A=1/1x2+1/2x3+1/3x4+......+1/99x100
1/1x2 + 1/2x3 + 1/3x4 +......+1/98x99 + 1/99x100
1/1X2 + 1/2X3 + 1/3X4 +...+1/99X100+ 1/100X101
tính:A=1/1x2+1/2x3+1/3x4+1/4x5+...+1/99x100
Tính A= 1/1x2+1/2x3+1/3x4+........+1/98x99+1/99x100