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

Toán Lớp 5: 1/20 x 1 1/21 x 1 1/22 x ……x 1 1/2012 x 1 1/2013

Toán Lớp 5: 1/20 x 1 1/21 x 1 1/22 x ……x 1 1/2012 x 1 1/2013

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    cho 1 1/20 x 1 1/21 x ….. x 1 1/2013=21/20 x 22/21 x 23/22 x …… x 2014/2013
    =(21 x 22 x …. x 2014) / (20 x 21 x … x 2013) =2014/20=….

  2. 1 1/(20) xx 1 1/(21) xx 1 1/(22) xx …. xx 1 1/(2012) xx 1 1/(2013)
    = (21)/(20) × (22)/(21) × (23)/(22) × … × (2013)/(2012) × (2014)/(2013)
    = (21 × 22 × 23 × … × 2013 × 2014) / (20 × 21 × …× 2012 × 2013)
    = (2014)/(20)
    = (1007)/(10)

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

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