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

Toán Lớp 7: A=1/100.99-1/99.98-1/98.97=-1/3.2-1/2.1

Toán Lớp 7: A=1/100.99-1/99.98-1/98.97-……..-1/3.2-1/2.1

Comments ( 2 )

  1. Giải đáp:
    -9799/9900
    Lời giải và giải thích chi tiết:
    A=1/(100*99)-1/(99*98)-1/(98*97)-…-1/(3*2)-1/(2*1)
    A=1/(99*100)-(1/(1*2)+1/(2*3)+…+1/(97*98)+1/(98*99))
    A=1/99-1/100-(1-1/2+1/2-1/3+…+1/97-1/98+1/98-1/99)
    A=1/99-1/100-(1-1/99)
    A=1/99-1/100-98/99
    A=-97/99-1/100
    A=-(9700+99)/(99*100)
    A=-9799/9900
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  2. A = 1/100.99 – 1/99.98 – 1/98.97 – …. – 1/3.2 – 1/2.1
    A = 1/100.99 – (1/99.98 + 1/98.97 + … + 1/3.2 + 1/2.1)
    A = 1/100.99 – (1/1 – 1/2 + 1/2 – 1/3 + … + 1/97 – 1/98 + 1/98 – 1/99)
    A = 1/9900 – (1/1 – 1/99)
    A = 1/9900 – 98/99
    A = -9799/9900
     

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