50*51,51*52,52*53.98*99,99*100的倒数和

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50*51,51*52,52*53.98*99,99*100的倒数和
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50*51,51*52,52*53.98*99,99*100的倒数和
50*51,51*52,52*53.98*99,99*100的倒数和

50*51,51*52,52*53.98*99,99*100的倒数和
分数列项
1/(50×51)=1/50-1/51
1/(51×52)=1/51-1/52
.
1/(99×100)=1/99-1/100
原式=1/50-1/51+1/51-1/52+...+1/99-1/100
=1/50-1/100
=1/100

原式=[(1/50)-(1/51)]+[(1/51)-(1/52)]+……[(1/99)-(1/100)]
=(1/50)-(1/100)
=(2-1)/100
=1/100
希望能帮到你!

1/(50×51)=1/50-1/51
1/(51×52)=1/51-1/52
......
1/(99×100)=1/99-1/100
原式=1/50-1/51+1/51-1/52+...+1/99-1/100
=1/50-1/100
=1/100