Réponses

2014-01-06T20:04:41+01:00
B = 3 -(2-3x²)+(6-x)-(x²-x)
3 -2 +3x² +6 -x -x² +x
+2x² +7

C = 3(-2x)X 5x
-6x X 5x
-30x²
Meilleure réponse !
2014-01-06T20:06:11+01:00
B = 3 - 2 + 3x² + 6-x - x² +x
B = 12x² + 7 

C = (-6x ) x 5x
C = -30x²