Réponse :
1/3-1=1/3-3/3=-2/3
1/5+2=1/5+10/5=11/5
1+1/2=2/2+1/2=3/2
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Réponse :
1/3-1=1/3-3/3=-2/3
1/5+2=1/5+10/5=11/5
1+1/2=2/2+1/2=3/2