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

Toán Lớp 5: bài 2 : tính nhanh 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64

Toán Lớp 5: bài 2 : tính nhanh
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64

Comments ( 2 )

  1. Ta có : 1/2 = 1 – 1/2
               1/4 = 1/2 – 1/4
               1/8 = 1/4 – 1/8 
    ….
              1/64 = 1/32 – 1/64
    Ta được 1 – 1/2 + 1/2 – 1/4 +…. + 1/32 – 1/64
    = 1 – 1/64
    = 63/64
     

  2. #dung
    1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
    =1/2+1/2+1/2+1/2+1/2
    =1/10

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

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