Répondre :
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
=(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