Réponses

2013-03-09T15:40:47+01:00

1. x+(1+2x) = 3x + 1

3 - (5x+4) = -5x - 1

8x - (-7 - 2x) = 10x + 7

 

2. 3(x-5) = 3x - 15

-8 (4 + 7x) = -32 -56x

(x+5)(x-3) = x² - 3x + 5x - 15 = x² + 2x - 15