4/1*3-8/3*5+12/5*7+...-40/19*21会的请回,1

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4/1*3-8/3*5+12/5*7+...-40/19*21会的请回,1
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4/1*3-8/3*5+12/5*7+...-40/19*21会的请回,1
4/1*3-8/3*5+12/5*7+...-40/19*21
会的请回,1

4/1*3-8/3*5+12/5*7+...-40/19*21会的请回,1
4/1*3-8/3*5+12/5*7+...-40/19*21
=1+1/3-1/3-1/5+1/5+1/7-……-1/19-1/21
=20/21