Répondre :
A = (3/4)+(2/3) x (2/5 +3/10)
A = (3/4) +(2/3) x (4/10+3/10)
A = (3/4) + (2/3 x 7/10)
A = (3/4) + (14/30)
A = 90/120 + 42/120
A = 132/120 = 33/30
B = 9/5 : 3/4
B = 9/5 x 4/3
B = 36/15
a.
= (3/4)+(2/3) x (2/5 +3/10)
= (3/4) +(2/3) x (4/10+3/10)
= (3/4) + (2/3 x 7/10)
= (3/4) + (14/30)
= 90/120 + 42/120
= 132/120 = 33/30
b.
= 9/5 : 3/4
= 9/5 x 4/3
= 36/15
voilà..... )