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

Toán Lớp 6: tính : 7/12 + 5/6 – 1 ====== 5 – 3/4 + 1/3

Toán Lớp 6: tính : 7/12 + 5/6 – 1
——————
5 – 3/4 + 1/3

Comments ( 2 )

  1. Giải đáp:
    (7/12 + 5/6 – 1)/(5 – 3/4 + 1/3)
    = (7/12 + 10/12 – 12/12)/(60/12 – 9/12 + 4/12)
    = ((7+10-12)/12)/((60 – 9 + 4)/12)
    = (5/12)/(55/12)
    = 5/12 : 55/12
    = 5/12 xx 12/55
    = ( 5 xx 12)/ ( 12 xx 55 )
    = ( 5 xx \cancel12)/ ( \cancel12 xx 55 )
    = 5/55 = 1/11
     

  2. {7/12 + 5/6 – 1}/{5 – 3/4 + 1/3}
    = {7/12 + 10/12 – 12/12}/{60/12 – 9/12 + 4/12}
    = 5/12 : 55/12
    = 5/12 . 12/55
    = {5 . 12}/{12 . 55} (ta thấy có 12 trên tử, và 12 dưới mẫu, ta gạch bỏ đi)
    = 5/55 = 1/11

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

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