Bonjour, vous pouvez m'aider svp​

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.