Explications étape par étape:
O) 3/1 + 3/1 = 3+3/1 = 6/1=6
P) 5/3 + 2/3 = 5+2/3 = 7/3
Q) 3/1 + 1/3 = 3×3/1×3 + 1/3 = 9/3 + 1/3 = 9+1/3= 10/3
R) 6/4 + 8/4= 6+8/4 = 14/4 = 14:2/4:2 = 7/2
S) 3/4 + 8/2 = 3/4 + 8×2/2×2 = 3/4 + 16/4 = 3+16/4 = 19/4
T) 6/5 + 4/1 = 6/5 + 4×5/1×5 = 6/5 + 20/5= 6+20/5 = 26/5
