Réponses

2013-11-23T15:57:40+01:00
A = x(x+5)-(5x-4)
   =x²+5x-5x+4
   =x²+4
B = -3(2y-1)-(3y-2)
   =-6y+3-3y+2
   =-9y+5
C = -4z+4(3-4z)
   =-4z+12-16z
   =-20z+12
2013-11-23T16:03:45+01:00
A= x ( x + 5 ) - ( 5x - 4 )
=x²+5x-5x+4
=x²+4

B= -3 (2y - 1) - (3y - 2)
=-6y+3-3y+2
=-9y+5

C= -4z + 4 (3-4z)
=-4z+12-16z
=-20z+12