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Sagot :

VINS

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a.  - 5/14 - 3 /7 = - 5 /14 - 6/14 = - 11 /14

b . 2/9 - 5 /27 = 6/27 - 5 /27  = 1/27

c.  - 3/20 - 2/5 = - 2/20 - 8/20 = - 10/20 = - 1 /2

JODEVI

Réponse :

a:  -5/14 - 3/7 = -5/14 - (3x2)/(7x2) = -5/14 - 6/14 = -11/14

b:  2/9 - 5/27 = (2x3)/(9x3) - 5/27 = 6/27 - 5/27 = 1/27

c:  3/20 - 2/5 = 3/20 - (2x4)/(5x4) = 3/20 - 8/20 = -5/20 = -1/4

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