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Sagot :

b=(2-2/3)/(3+1/6)
  =(6/3-2/3)/(18/6+1/6)
  =(4/3)/(19/6)
  =(8/6)/(19/6)
  =8/19

c=(1/4+5/6)/(1/2-1)
  =(6/24+20/24)/(-1/2)
  =-2*26/24
  =-52/24
  =-13/6

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