Bonjour
1)
A = (5/2 + 1/6) / (2/3 + 2)
A = [(5 x 3) / (2 x 3) + 1/6] / [2/3 + (2 x 3) / (1 x 3)]
A = (15/6 + 1/6) / (2/3 + 6/3)
A = 16/6 : 8/3
A = 16/6 x 3/8
A = 48/48
A = 1
B = 2 + 3 / (2/5 + 3)
B = 2 + 3 / [2/5 + (3 x 5) / (1 x 5)]
B = 2 + 3 / (2/5 + 15/5)
B = 2 + 3 / 17/5
B = 2 + 3 x 5/17
B = 2 + 15/17
B = (2 x 17) / (1 x 17) + 15/17
B = 34/17 + 15/17
B = 49/17
2) A est un nombre décimal
B n'est pas un nombre décimal.