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Sagot :

Réponse:

Ex:32

a. -3/10×5/12=-15/120=-3/24.

b.25/16×-12/15=-300/240=-5/4.

c.-9/28×56/63=-504/1764=-126/441.

Ex:33

a.5/7×1/3×-1/2=-5/42.

b.-3/5×-1/2×-2/7=-6/70=3/35.

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