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1/2+1/6+1/12+……+1/9900
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(99×100)
=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/99-1/100)
=1-1/100
=99/100
(1/2+5/6+11/12+......+9899/9900)+(1/2+1/6+1/12+……+1/9900)
=1+1+1+……+1(共99个,分母从1×2到99×100)
=99
所以
1/2+5/6+11/12+......+9899/9900
=99-(1/2+1/6+1/12+……+1/9900)
=99-99/100
=9801/100
记得采纳我的答案哦,祝你学习进步
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(99×100)
=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/99-1/100)
=1-1/100
=99/100
(1/2+5/6+11/12+......+9899/9900)+(1/2+1/6+1/12+……+1/9900)
=1+1+1+……+1(共99个,分母从1×2到99×100)
=99
所以
1/2+5/6+11/12+......+9899/9900
=99-(1/2+1/6+1/12+……+1/9900)
=99-99/100
=9801/100
记得采纳我的答案哦,祝你学习进步
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