1/2X2/3X3/4.X99/100X100/101递等式计算

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1/2X2/3X3/4.X99/100X100/101递等式计算1/2X2/3X3/4.X99/100X100/101递等式计算1/2X2/3X3/4.X99/100X100/101递等式计算1/2X

1/2X2/3X3/4.X99/100X100/101递等式计算
1/2X2/3X3/4.X99/100X100/101递等式计算

1/2X2/3X3/4.X99/100X100/101递等式计算
1/2X2/3X3/4.X99/100X100/101(约去中间的）
=1/101

1/101

1/101 中间的都约掉了

1/101.
前项分母和后项分子约分就完了。