bonjour
a.7/12-5/6×1/2
priorité à la multiplication
7/12- 5/12 = 2/12 = 1/6
b.7/4÷2-1/6×2/3
7/4 * 1/2 -2/18
= 7/8 -2/8 = 5/8
c.3*7/12÷(5/6+1/2)
(21/12) / (5/6 + 3/6)
= (21/12) / (8/6)
= (21/12 )/( 4/3)
=21/12 * 3/4 = 63/48 = 21/16
d.(3/5)²-(-5)/6
= 9/25 +5/6
= 54/150 + 125/150
= 179/150
