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

Toán Lớp 6: tính : A= 1/6 – 1/35 – 1/63 – 1/99 – 1/143 – 1/195

Toán Lớp 6: tính : A= 1/6 – 1/35 – 1/63 – 1/99 – 1/143 – 1/195

Comments ( 2 )

  1. A= 1/6 – 1/5×7 – 1/7×9 – 1/9×11 – 1/ 11×13
    -> A x2 =1/3- ( 2/5×7 + 2/7×9 + 2/9×11 + 2/ 11×13 ) 
    -> Ax2 =1/3- ( 1/5 – 1/7 +….+ 1/11-1/13 )
    -> Ax2 = 1/3- ( 1/5-1/13 ) 
    -> Ax2 = 1/3- 8/35
    -> Ax2 = 3/35
    -> A = 3/35 : 2
    -> A= 3/70 
    Chúc chủ tus học tốt

  2. Giải đáp + Lời giải và giải thích chi tiết:
    A=1/6-1/35-1/63-1/99-1/143-1/195
    =>A=1/6-(1/35+1/63+1/99+1/143+1/195)
    =>A=1/6-(1/5.7+1/7.9+1/9.11+1/11.13+1/13.15)
    =>A=1/6-(1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15)
    =>A=1/6-(1/5-1/15)
    =>A=1/6-1/5+1/15
    =>A=5/30-6/30+2/30
    =>A=1/30
     

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

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