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Sagot :

Bonsoir

(a/b) / (c/d) = (a*d)/ (b*c)

A=

3/5 * 11/7 = 33/35

B=

-1/7 * -8 /7 = 8/49

C=

-6/13 * -12/39 = 72/ 507 = 24/169

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