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

Toán Lớp 6: (-16)+15= (-31)+19 17+(-30) = (-19)+5=

Toán Lớp 6: (-16)+15=
(-31)+19
17+(-30) =
(-19)+5=

Comments ( 2 )

  1. (-16)+15=-1
    (-31)+19=-12                                                                       
     17+(-30)=-13
      (-19)+5=-14 
     

  2. (-16) + 15
    = -(16 – 15)
    = -1
    (-31) + 19
    = -(31 – 19)
    = -12
    17 + (-30)
    = -(30 – 17)
    = -13
    (-19) + 5
    = -(19 – 5)
    = -14
     

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