le ' correpond au carré
exercice 1
(11-2/7)'=121-44/7y+4/49y'
(1/3t+9/5)(1/3t-9/5)=1/9t'-81/25
(4z+7)'=16z'+56z+49
exercice 2
a 3x (x+3)
b (x+1)(3-2x-1)=(x+1)(2-2x)
c. (x+3)'
d. (5x-1)'
e. (7a-1)(7a+1)
f. (5x-2-4x)(5x-2+4x)=(x-2)(9x-2)
g. (1-4x-x+2)(1-4x+x-2)=(3-5x)(-1-3x)
h. (x+1)(3-x-1)=(x+1)(2-x)
exercice 3
1) 16x'+8x+1+4x'+x-8x - 2=20x'+x-1
2) (4x+1)(4x+1+x-2)=( 4x+1)(5x-1)
3) pour x=0. 1'+(-2*1)=1-2=- 1
pour x=- 1. (-4+1)'+(-1-2)(-4+1)=9+(-3*-3)=9+9=18