Simplifier :

2x + 6 +1 (8x+9)

2x + 6 + 1 (8x-9)

2x+6 -1 ( 8x+9)

2x+6-1 (8x-9)

1
je suis trop bete
1) 2x + 6 + 1 (8x + 9) = 2x + 6 + 8x + 9 = 10x + 15
2) 2x + 6 + 1(8x - 9) = 2x + 6 + 8x - 9 = 10x - 3
3) 2x + 6 - 1(8x + 9) = 2x + 6 - 8x - 9 = -6x - 3
4) 2x + 6 - 1(8x - 9) = 2x + 6 -8x + 9 = -6x + 15

Réponses

2014-03-02T16:16:49+01:00
2x+6+1(8x+9)= 2x+6+8x+9 = 10x+15 2x+6+1(8x-9)= 2x+6+8x-9 = 10x-3 2x+6-1(8x+9)= 2x+6-8x-9 = -6x-3 2x+6-1(8x-9)= 2x+6-8x+9 = -6x+15