Réponses

2013-10-16T18:12:05+02:00
A) (7x+1)²=49x²+14x+1

b) (x-3)²=x²-6x+9

c) ( 1/3 - 3/4a)²
=1/9-2*3/12a+9/16a²
=1/9-3/6a+9/16a²
=16/144+81/144-72/144a²
=97/144-1/2a²

d) (-3-2x)²=9+12+4x²

e) (5x-4)²=25x²-40x+16

f) (1/2x-4)²=1/4x²-4x+16
2013-10-16T18:55:24+02:00
Bonsoir
a) (7x+1)²  = 49x² +14x+3
 b) (x-3)²  = x² -6x +9
  c) ( 1/3 - 3/4a)² = 1/9 - 6/12a+9/16a²
d) (-3-2x)²   = 9 - 12x +2x²
   e) (5x-4)²  = 25x² -40x +16
 f) (1/2x-4)²
= 1/4x² - 8x/2 +16