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

Toán Lớp 7: 1/3.4 – 1/4.5 – 1/5.6 – 1/6.7 – 1/7.8 – 1/8.9 =

Toán Lớp 7: 1/3.4 – 1/4.5 – 1/5.6 – 1/6.7 – 1/7.8 – 1/8.9 =

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    1/3.4 – 1/4.5 -…….- 1/8.9
    -> 1/3.4 – ( 1/4 – 1/5 +……….+ 1/8 – 1/9 )
    -> 1/12 – ( 1/4 – 1/9 )
    -> 1/12 – 5/36
    -> 3/36 – 5/36 = -1/18
    #Dung09 

  2. 1/{3.4} – 1/{4.5} – 1/{5.6} – 1/{6.7} – 1/{7.8} – 1/{8.9}
    = 1/{3.4} – (1/{4.5} + 1/{5.6} + 1/{6.7} + 1/{7.8} + 1/{8.9})
    = 1/{3.4} – (1/4 – 1/5 + 1/5 – 1/6 + 1/6 – 1/7 + 1/7 – 1/8 + 1/8 – 1/9)
    = 1/{3.4} – (1/4 – 1/9)
    = (1/3 – 1/4) – (9/36 – 4/36)                 
    = (4/12 – 3/12) – 5/36
    = 1/12 – 5/36
    = 3/36 – 5/36
    = -2/36
    = -1/18
     

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

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