Sagot :
exercice 7
a)
(5-t)²
(-t)²+2*(-t)*5+5²
t²-10t+25
c)
(4y-1)²
(4y)²+2*4y*(-1)-1²
16y²-8y+1
d)
(3x-7)²
(3x)²+2*3x*(-7)-7²
9x²-42x+49
A) (5-i)^2=25 -10i +i^2
C) (4y-1)^2=16y^2 -8y +1
D) (3x-7)^2= 9x^2 -42x +49
H) (1,4x-1)^2= 1,96x^2 -2,8x +1