Réponses

2012-10-13T22:16:31+02:00

2a=2*(-5)=-10

ab=(-5)*9=-45

5a+3b=5*(-5)+3*9=-25+27=2

-a-b=-(-5)-9=5-9=-4

(a+3)(b+6)=(-5+3)(9+6)=(-2)*15=-30

a2=2a=-10

(2b)2=(2*9)2=18*2=36

 

2012-10-13T22:26:57+02:00

2x5: 10

5x9:45

25+27: 52
-5-9: -14 

8x15: 120

5x2:10

18x2: 36