Bonjour / = fraction En dessus ce n'est pas une question 3/4 × 8/21 ? (3/4 - 5/3) ÷ -7/12 ? 7x = 20 ? x/8 = 4 ? x/3 = 10/5

Bonjour

3/4 × 8/21 = 24/84 = (12 x 2) / (12 x 7) = 2/7

(3/4 - 5/3) ÷ -7/12

= [(3 x 3) - (4 x 3) - (5 x 4) / (3 x 4)] : - 7/12

= (9/12 - 20/12) : - 7/12

= - 11/12 x - 12/7

= 132/84

= (12 x 11) / (12 x 7)

= 11/7

7x = 20

x = 20/7

x/8 = 4

x = 32

x/3 = 10/5

5x/15 = 30/15

5x = 30

x = 30/5

x = 6.