1/(2/3)/(3/4)/(4/5)/./(1999*2000)简便方法
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1/(2/3)/(3/4)/(4/5)/./(1999*2000)简便方法
1/(2/3)/(3/4)/(4/5)/./(1999*2000)简便方法
1/(2/3)/(3/4)/(4/5)/./(1999*2000)简便方法
1/(2/3)/(3/4)/(4/5)/./(1999/2000)=2000/2=1000