Réponses

2013-06-02T12:22:42+02:00

(24d-9) (19-40d)

=456d- 960d² - 171 +360d 

= -960d² +816d -171

8(6c+9)-(7c+2)(9c+3)

=48c +72 - ( 63c² + 21c + 18c + 6)

= 48c + 72 -63c² -21c -18c -6

= -63c² +9c + 66.


-6(z-9)-(9+4z)

= -6z + 54 - 9 -4z

= - 10z +45