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2012-09-12T17:22:51+02:00

 A= 12-3-7+1-4

   = 13-14

   = -1 

 

B=14-(5-11)

  =14-(-6)

  = 14+6

  = 20


C=(-8+2)+(5-9)

  = -6 +(-4)

  = -6-4

  = 10


D= (3-10)-(7+1)

  = (3-10) + (-7-1)

  = -7 -8

  = -15


E= 6X4-3X5

  = 24 - 15 

  = 9


 F= 5-18:6+1

   = 5 -3 +1

   = 2 + 1 

   = 3