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Sagot :

Réponse:

Bonsoir

Explications étape par étape:

30) A= (2/3)/4

= 2/3 × 1/4

= 1/6

B= 2/(3/4)

= 2 × 4/3

= 8/3

C= (1/2 - 1/4) / 1/4

= ( (2-1) /4 ) / 1/4

= 1/4 × 4

= 1

D= (2/3 - 1) / (2/3 + 1)

= ( (2-3)/3) / (2+3/3)

= -1/3 × 3/5

= -1/5

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