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

Toán Lớp 4: a,8/9-2/8+2/8=??? b,4/3+2/4+5/5=???

Toán Lớp 4: a,8/9-2/8+2/8=???
b,4/3+2/4+5/5=???

Comments ( 2 )

  1. a) 8/9 – 2/8 + 2/8
    = 8/9 – 1/4 + 1/4
    = 32/36 – 9/36 + 9/36
    = ( 32 – 9 + 9)/36
    = 32/36
    = 8/9
    b) 4/3 + 2/4 + 5/5
    = 4/3 + 1/2 + 1
    = 8/6 + 3/6 + 6/6
    = 17/6

  2. Bài làm :
    a) 8/9 – 2/8 + 2/8
    = 8/9 + ( 2/8 – 2/8 )
    = 8/9
    Vậy 8/9 – 2/8 + 2/8 = 8/9
    b) 4/3 + 2/4 + 5/5
    = 4/3 + 1/2 + 1 ( Rút gọn phân số )
    = 8/6 + 3/6 + 6/6
    = 17/6
    Vậy 4/3 + 2/4 + 5/5 = 17/6
     

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

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