1
a) A=1 +1/3+1/5+.....+1/97+1/99
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1/1.99+1/3.97+1/5.99+......+1/97.3+1/99.9
b) B=1/2+1/3+1/4+.....+1/99+1/100
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99/1+98/2+97/3+......+1/99
2a)CM: 2n/b(b+m)(b+2m)=1/b(b+m)-1/(b+m)(b+2m)
b)Tính tổng:S=1/1.2.3+1/2.3.4+1/3.4.5+....+1/37.38.39
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