1/2x2/3x3/4...x99/100x100/101要过程.

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1/2x2/3x3/4...x99/100x100/101要过程.
1/2x2/3x3/4...x99/100x100/101要过程.
 

1/2x2/3x3/4...x99/100x100/101要过程.
原式=1/101