Bonjour
a. 2 + 3 x 4/5
= 2 + 12/5
= (2 x 5) / (1 x 5) + 12/5
= 10/5 + 12/5
= 22/5
b. 12/35 x 14/9 x 15/8
= 168/315 x 15/8
= 2520/2520
= 1
c. 5/4 : 35/7
= 5/4 x 7/35
= 35/140
= (35 x 1) / (35 x 4)
= 1/4
d. 7/4 : 35/18
= 7/4 x 18/35
= 126/140
= (14 x 9) / (14 x 10)
= 9/10
e. z = 3 : (2 + 1/4)
z = 3 : [(2 x 4) / (1 x 4) + 1/4]
z = 3 : (8/4 + 1/4)
z = 3 : 9/4
z = 3 x 4/9
z = 12/9
z = (3 x 4) / (3 x 3)
z = 4/3
t = 3/2 + 3 : 1/4
t = 3/2 + 3 x 4
t = 3/2 + 12
t = 3/2 + (12 x 2) / (1 x 2)
t = 3/2 + 24/2
t = 27/2
f. x = 6/35 : 9
x = 6/35 x 1/9
x = 6/315
x = (3 x 2) / (3 x 105)
x = 2/104
y = 6 : 35/9
y = 6 x 9/35
y = 54/35.
