Réponses

2012-11-04T13:30:34+01:00

a=3 b=-4 c=-5 d=7

A=-5*3*-5 + -4*7

= 75 - 28

= 47

 

B= 2(a-b) +d

= 2(3-(-4)) + 7

= 2(7) + 7

= 14+7

= 21

 

C= ac-bd

= 3*-5 - (-4)*7

= -15 + 28

= 13

 

En espérant t'avoir aidé.

2012-11-04T13:34:28+01:00

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