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Sagot :

Bonjour,

a)

16/28 = 4/7

b)

-10/18 = - 5/9

c)

-63/36 = - 7/4

d)

10/60 = 1/6

e)

-6/30 = -1/5

f)

-56/120 = -28/60 =  -14/30 =-7/15

exercice 6

7/5 de tours -> 2/3mm

1/5 ->  (2/3 )/7

1 tour: (2/3*5)/7

3 tours -> (2/3*3*5)/7 = (30/3)/7 =10/7 =>1,43mm

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