Réponses

2012-09-19T18:32:09+02:00

a) 1,5+(-5)x2,5+(-5,5)x(-2)

=1.5-12,5+11

= 11-11

=0 

 

b) (13-2,5)x(3-10)+(-5)x(-18)

=10,5x(-7)+90

=-73,5+90

=16.5

 

Voila .

2012-09-19T18:34:33+02:00

a) 1.5+(-5)x2.5+(-5.5)x(-2)=1.5+(-12.5)+11=0

b) (13-2.5)x(3-10)+(-5)x(-18)=10.5x(-7)+90=-73.5+90=16.5