Réponse :
Explications étape par étape :
a) opposé de D = -D = -(-21/9) = 21/9 = 7/3
b) inverse de E = 1/E = 1/(-(28/15) = 1 x (-15/28) = -15/28
c) Opposé de 1/D
1/D = 1/(7/3) = 3/7 ⇒ opposé de 1/D = -3/7
d) inverse D/E = E/D = (-28/15)/(-21/9) = (28/15) x (9/21) = (28 x 9)/(15 x 21)
= (4 x 7 x 3 x 3)/(3 x 5 x 3 x 7) = 4/5
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Réponse :
Explications étape par étape :
a) opposé de D = -D = -(-21/9) = 21/9 = 7/3
b) inverse de E = 1/E = 1/(-(28/15) = 1 x (-15/28) = -15/28
c) Opposé de 1/D
1/D = 1/(7/3) = 3/7 ⇒ opposé de 1/D = -3/7
d) inverse D/E = E/D = (-28/15)/(-21/9) = (28/15) x (9/21) = (28 x 9)/(15 x 21)
= (4 x 7 x 3 x 3)/(3 x 5 x 3 x 7) = 4/5