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

Toán Lớp 6: -(-2012 + 789)+(-211)+(-1012 – 1789) đố ai làm được cho5 sao

Toán Lớp 6: -(-2012 + 789)+(-211)+(-1012 – 1789)
đố ai làm được cho5 sao

Comments ( 2 )

  1. – ( – 2012 + 789 ) + ( – 211 ) + ( – 1012 – 1789 )
    = 2012 – 789 + ( – 211 ) + ( – 1012 ) – 1789
    = [ 2012 + ( – 1012 ) ] – [ 789 – ( – 211 ) ] – 1789
    = 1000 – 1000 – 1789
    = 0 – 1789
    = – 1789

  2. -(-2012+789)+(-211)+(-1012-1789)
    = 2012-789-211-1012-1789
    = (2012-1012)-(789+211)-1789
    = 1000-1000-1789
    =0-1789
    =-1789.

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

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