a=3 b=-4 c=-5 d=7
A=-5ac + bd
B= 2(a-b) +d
C= ac-bd
A=-5*3*-5 + -4*7
= 75 - 28
= 47
= 2(3-(-4)) + 7
= 2(7) + 7
= 14+7
= 21
= 3*-5 - (-4)*7
= -15 + 28
= 13
En espérant t'avoir aidé.
A=-5ac + bd = -5*3*(-5) + (-4)*7 = 75-28 = 47
B= 2(a-b) +d = B= 2(3+4) +7 = 2*7 + 7=14+7=21
C= ac-bd = 3*(-5)+4*7 = 28 - 15 = 13
