Répondre :
(-3/4+1/2)/(2/5-5/2)
(-3/4+2/4)/(4/10-25/10)
(-1/4)/(-21/10)
1/4x10/21=10/84 ou 5/42
(2/3)/(5/6-2/5)
(2/3)/(25/30-12/30)
(2/3)/(13/30)
2/3x30/13=60/39 ou 20/13
(-3/4+2/4)/(4/10-25/10)
(-1/4)/(-21/10)
1/4x10/21=10/84 ou 5/42
(2/3)/(5/6-2/5)
(2/3)/(25/30-12/30)
(2/3)/(13/30)
2/3x30/13=60/39 ou 20/13