分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000

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分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000
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分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000
分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000

分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000
(1985+1987+1989+.1999)/(1986+1988+1990+.2000 )
=(1985+1999)*13/2÷【(1986+2000)*13/2】
=3984/3986
=19992/1993