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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
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
