Bonjour, je dois faire cet exercice mais je n'y comprends rien:
il faut calculer et donner le resultat sous la forme fractionaire la plus simple possible:
A= (-24÷21)÷(-32÷14)
B= (45÷-18)÷(15÷12)
C= (-17÷-27)÷(-34÷-21)
D=(39÷-42)÷(-26÷56)
E=(3÷4÷9)÷(1÷2÷6)

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