A原式=(1/1-1/3)÷2+(1/3-1/5)÷2+(1/5-1/7)÷2……(1/2013-1/2015)÷2 =(1-1/2015)÷2 =1007

恬恬2019-12-17  10

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答案A

解析原式=(1/1-1/3)÷2+(1/3-1/5)÷2+(1/5-1/7)÷2……(1/2013-1/2015)÷2=(1-1/2015)÷2=1007/2015
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