Répondre :

droopette
(3/4+3)/(1/3+2)
=(3/4+12/4)/(1/3+6/3)
=(15/4)/(7/3)
=15/4 x 3/7
=45/28

(4/3+3/10)/(5/2-2/5)
=(40/30+9/30)/(25/10-4/10)
=(49/30)/(21/10)
=49/30 x 10/21
=7/3 x 1/3
=7/9

(1/4-1/5) x (7+37/9)
=(5/20-4/20) x (63/9+37/9)
=1/20 x 100/9
=1 x 5/9
=5/9

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