(1983+1985+……+1999)/(1984+1986+……+2000)

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(1983+1985+……+1999)/(1984+1986+……+2000)

(1983+1985+……+1999)/(1984+1986+……+2000)
=【(1983+1999)×9÷2】/【(1984+2000)×9÷2】
=(1983+1999)/(1984+2000)
=3982/3884
=1991/1992