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

Toán Lớp 6: Thực hiện các phép tính (có sử dụng BCNN): 11/15 + 9/10 5/6 + 7/9 + 11/12 7/24 – 2/11 11/36 – 7/24

Toán Lớp 6: Thực hiện các phép tính (có sử dụng BCNN):
11/15 + 9/10
5/6 + 7/9 + 11/12
7/24 – 2/11
11/36 – 7/24

Comments ( 2 )

  1. 11/15 + 9/10
    = 22/30 + 27/30
    = 49/30
    _________________________________
    5/6 + 7/9 + 11/12
    = 30/36 + 28/35 + 33/36
    = 58/36 + 33/36
    = 91/36
    ________________________________
    7/24 – 2/11
    = 77/264 – 48/264
    = 29/264
    ________________________________
    11/36 – 7/24
    = 22/72 – 21/72
    = 1/72

  2. a)
    11/15+9/10
    =22/30+27/30
    =(22+27)/30
    =49/30
    b)
    5/6 + 7/9 + 11/12
    =30/36 + 28/36 + 33/36
    =(30+28+33)/36
    =91/36
    c)
    7/24 – 2/11
    =77/264 – 48/264
    =(77-48)/264  
    =(29)/264  
    d)
    11/36 – 7/24
    =22/72 – 21/72
    =(22-21)/72
    =1/72

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

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