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equations : 1) 5 :7 x = 3:4 
                  2) 2,4:3,5x=8:15 
                   3)5:8x=40

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LOULAKAR

Bonjour,

Equations :

1) 5 :7 x = 3:4

5/7 x = 3/4

x = 3/4 * 7/5

x = 21/20

2) 2,4:3,5x=8:15

2,4/3,5 x = 8/15

24/35 x = 8/15

x = 8/15 * 35/24

x = 35/15 * 8/24

x = (7*5)/(3*5) * 8/(3*8)

x = 7/3 * 1/3

x = 7/9

3)5:8x=40

5/8 x = 40

x = 40 * 8/5

x = 64