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

Toán Lớp 6: A=(1-1/3)+(1-1/15)+(1-1/35)+(1-1/63)

Toán Lớp 6: A=(1-1/3)+(1-1/15)+(1-1/35)+(1-1/63)

Comments ( 2 )

  1. A = ( 1 – 1/3 ) + ( 1 – 1/15 ) + ( 1 – 1/35 ) + ( 1 – 1/63 )
    A = ( 1 + 1 + 1 + 1 ) – ( 1/3 + 1/15 + 1/35 + 1/63 )
    A = 4 – 1/2 × ( 1/{1 × 3} + 1/{3 × 5} + 1/{5 × 7} + 1/{7 × 9} )
    A = 4 – 1/2 × ( 1/1 – 1/3 + 1/3 – 1/5 + 1/5 – 1/7 + 1/7 – 1/9 )
    A = 4 – 1/2 × ( 1/1 – 1/9 )
    A = 4 – 1/2 × 8/9
    A = 4 – 4/9
    A = 32/9
    Vậy A = 32/9
    #dtkc

  2. Giải đáp + Lời giải và giải thích chi tiết:
    A = (1 – 1/3) + (1 – 1/15) + (1 – 1/35) + (1 – 1/63)
    A = ( 1 + 1 + 1 + 1) – (1/3 + 1/15 + 1/35 + 1/63)
    A = 4 – 1/2 × (1/1×3 + 1/3×5 + 1/5×7 + 1/7×9)
    A = 4 – 1/2 × (1/1 – 1/3 + 1/3 – 1/5 + 1/5 – 1/7 + 1/7 – 1/9)
    A = 4 – 1/2 × (1/1 – 1/9)
    A = 4 – 1/2 × 8/9
    A = 4 – 4/9
    A = 32/9
    Vậy A = 32/9 .
    Xin hay nhất để có thêm động lực !
    Chúc hok tốt !

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

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