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

Toán Lớp 6: A) 1/5.6 + 1/6.7 + 1/7.8 +-+1/99.100

Toán Lớp 6: A) 1/5.6 + 1/6.7 + 1/7.8 +….+1/99.100

Comments ( 2 )

  1. Giải đáp:
    Lời giải và giải thích chi tiết:
    A) 1/5.6 + 1/6.7 + 1/7.8 +….+1/99.100
    =1/5-1/6+1/6-1/7+1/7…….+1/99-1/100
    =1/5-1/100
    =20/100-1/100
    =19/100

  2. a, 1/5.6+1/6.7+1/7.8+…+1/99.100
    =(6-5)/5.6+(7-6)/6.7+(8-7)/7.8+…+(100-99)/99.100
    =1/5-1/6+1/6-1/7+1/7-1/8+…+1/99-1/100
    =1/5+(-1/6+1/6)+(-1/7+1/7)+(-1/8+1/8)+…+(-1/99+1/99)-1/100
    =1/5-1/100
    =20/100-1/100
    =19/100
     

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

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