Réponses

2013-05-19T12:58:03+02:00

A:(x-9)(-2x-5)

A:-2x²-5x+18x+45

A:-2x²+15x+45

 

B:(-3x-12)(5x-1/6)

B:-15x²+1/2x-60x+2

B:-15x²-59.5x+2

 

C:(-x-2/3)(3/4-x)

C:-3/4x+x²-1/2+2/3x

C:x²-1/12x-1/2

 

D:(t+1/2)(t-1/2)

D:(t²-1/2t+1/2t-0.25

D:t²-0.25