Réponse :
Explications étape par étape :
Ex 1.
a. 1/15 + 1/3 = 1/15 +5/15 = 6/15
b. 9/8 + 7/32 = 36/32 + 7/32 = 43/32
c. 7/8 + 6/32 = 28/32 + 6/32 = 32/32 = 1
d. 3/35 + 6/5 = 3/35 + 42/35 = 45/35
e. 7/12 + 10/3 = 7/12 + 40/12 = 47/12
f. 5/7 + 8/35 = 25/35 + 8/35 = 33/35
Ex 2.
a. 3/7 - 4/63 = 24/63 - 4/63 = 20/63
b. 10/3 - 2/15 = 50/15 - 2/15 = 48/15
c. 4/35 - 1/5 = 4/35 - 7/35 = -3/35
d. 7/16 - 3/4 = 7/16 - 12/16 = -5/12
e. 8/3 - 2/9 = 24/9 - 2/9 = 22/9
f. 1/2 -3/10 = 5/10 - 3/10 = 2/10 = 1/5
g. 9/7 + 10/21 = 27/21 - 10/21 = 17/21
h. 9/10 - 3/5 = 9/10 - 6/10 = 3/10
