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

Toán Lớp 5: tính 1/2 + 1/4 + 1/8 + 1/16 + -… + 1/256 + 1/512 gấp

Toán Lớp 5: tính
1/2 + 1/4 + 1/8 + 1/16 + ……. + 1/256 + 1/512
gấp

Comments ( 2 )

  1. 1/2 + 1/4 + 1/8 + 1/16 + … + 1/256 + 1/512
    = 1/( 1 × 2 ) + 1/( 2 × 2 ) + 1/( 2 × 4 ) + 1/( 4 × 4 ) + … + 1/( 16 × 16 ) + 1/( 16 × 32 )
    = 1 – 1/2 + 1/2 – 1/2 + 1/2 – 1/4 + 1/4 – 1/4 + … + 1/16 – 1/32
    = 1 – 1/32
    = 31/32
    – Giải đáp = 31/32
    @ Rin

  2. Đặt A=1/2+1/4+1/6+1/8+1/16+…+1/256+1/512
    =(1/2+1/4+1/8+1/16+…+1/256+1/256-1/512)+1/6
    =(1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+…+1/128-1/256+1/256-1/512)+1/6
    =1-1/512+1/6
    =1789/1536
    Vậy A=1789/1536
    Cho mk xin 5s và hay nhất nhaa

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