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

Toán Lớp 5: X = 1 + ½ + ¼ + 1/8 + … + 1/128 + 1/256

Toán Lớp 5: X = 1 + ½ + ¼ + 1/8 + … + 1/128 + 1/256

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    X=1+1/2+1/4+……..+1/128+1/256
    2 xx X=2+1+1/2+……..+1/64+1/128
    2 xx X – X = ( 2+1+1/2+……..+1/64+1/128 ) – ( 1+1/2+1/4+……..+1/128+1/256 )
    X = 2 – 1/256
    X = 2/1 – 1/256
    X = 512/256 – 1/256
    X = 511/256
    #Dung09 

  2. X = 1 + 1/2 + 1/4 + 1/8 + …….+ 1/128 + 1/256
    X x 2 = 2 x ( 1 + 1/2 + 1/4 + 1/8 + …….+ 1/128 + 1/256 )
    X x 2 = 2 + 1 + 1/2 + 1/4 + ………………. + 1/128
    X x 2 = 2 + ( 1 – 1/256 )
    X x 2 = 2 + 255/256
    X x 2 = 767/256
    X          = 767/256 : 2
    X          = 767/512
     

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

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