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

Toán Lớp 6: thu gọn các tổng sau: (a-b-c)-(a-c)

Toán Lớp 6: thu gọn các tổng sau: (a-b-c)-(a-c)

Comments ( 2 )

  1. (a-b-c)-(a-c)
    =a-b-c-a+c
    =(a-a)-b+(c-c)
    =0-b+0
    =-b
     

  2. (a-b-c)-(a-c)
    =a-b-c-a+c
    =(a-a)-b+(c-c)
    =0-b+0
    =-b

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

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