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

Toán Lớp 6: (-2) . (-20) + ( 1139 – 172 + 99 ) – (1139 + 99 – 172 )

Toán Lớp 6: (-2) . (-20) + ( 1139 – 172 + 99 ) – (1139 + 99 – 172 )

Comments ( 2 )

  1. (-2) . (-20) + ( 1139 – 172 + 99 ) – (1139 + 99 – 172 )
    =(-2) . (-20) + ( 1139 – 172 + 99 ) – (1139- 172 + 99  )
    =(2.20) +[ ( 1139 – 172 + 99 ) – (1139  – 172 + 99)]
    =40+0
    =40
     

  2. (-2) . (-20) + ( 1139 – 172 + 99 ) – (1139 + 99 – 172 )
    =40 + ( 1139 – 172 + 99 ) – (1139 + 99 – 172 )
    =40 + 1066 – 1066
    =40 + (1066 – 1066)
    =40 + 0
    =40

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