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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tính nhanh tổng sau: F=$\frac{1}{1.1985}$ +$\frac{1}{2.1986}$ +$\frac{1}{3.1987}$ +…+$\frac{1}{16.2000}$

Toán Lớp 7: Tính nhanh tổng sau: F=$\frac{1}{1.1985}$ +$\frac{1}{2.1986}$ +$\frac{1}{3.1987}$ +…+$\frac{1}{16.2000}$

Comments ( 1 )

  1. F=1/1.1985+1/2.1986+1/3.1987+………+1/16.2000
    1984F=1984/1.1985+1984/2.1986+1984/3.1987+……………+1984/16.2000
    1984F=1-1985+1/2-1/1986+1/3-1/1987+………..+1/16-1/2000
    1984F=1-1/2000
    1984F= 1999/2000
    F=1999/3968000

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222-9+11+12:2*14+14 = ? ( )