Réponse :
Explications étape par étape
Bjr,
B+C
-6/5 +2/3 = -18/15 +10/15 = -8/15
A-D
15/7 - (-4/3) = 45/21 + 28/21 = 73/21
A*B
15/7 * -6/5 = -90/35 = -18/7
C/D
(2/3)/(-4/3) = 2/3 * 3/-4 = 6 /-12 = 1/-2
2)
-4/3 -(2/3*-6/5) = -4/3 - (-12/15) = -4/3+ 12/15 = -20/15 +12/15 = -8/15
(-6/5 -4/3) /(2/3 -15/7)=
(-18/15 - 20/15 )/(14/21 - 45/21) =
-38/15 / -31/21=
-38/15 * 21/-31 = - 798/- 465 = 798/465= 266/155
☺
