1/(1990/1+1991/1+1992/1+...+1999/1)等于多少

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1/(1990/1+1991/1+1992/1+...+1999/1)等于多少1/(1990/1+1991/1+1992/1+...+1999/1)等于多少1/(1990/1+1991/1+1992/

1/(1990/1+1991/1+1992/1+...+1999/1)等于多少
1/(1990/1+1991/1+1992/1+...+1999/1)等于多少

1/(1990/1+1991/1+1992/1+...+1999/1)等于多少
1/(1990/1+1991/1+1992/1+...+1999/1)
=1/【(1990+1999)*10/2)】
=1/19945