Réponses

2013-12-16T20:31:41+01:00
12 x ( b+2) = 12b + 24
4 x (3b+8)= 12b + 32
b x (3b+4)= 3b² + 4b
-8b x (6+9b)= - 48b - 72b² 
9 x (2b-1)= 18b-9
9 x (2b-1)=18b-9
-6 x (2b+7)= -12b-42
8b x (3b-2)= 24b²-16b
-7 x (10-b)= -70 + 7b
2013-12-16T21:18:11+01:00
12b + 24
12b+32
3b²+4b
-48b+ 72b²
18b-9
-12b+ (-42)
24b²-16b
-70-7b