on donne a=-5 b=9 CALCULE LES EXPRESSIONS 2a;ab; 5a + 3b; -a -b; (a+3) (B+6); a2 ;(2b)2

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

2x5: 10

5x9:45

25+27: 52
-5-9: -14 

8x15: 120

5x2:10

18x2: 36