Pour les premier exercices tu les tape directement à la calculatrice et pour le 4 c'est comme celui-ci.
Ex 3:
A= 5(x-1)+3(x+1)
= 5x-5+3x+1
=8x-4
B= 2(x+8)-(x-6)
= 2x+16-x+6
= x+22
C= 7/3(x-3)-4/3(x-6)
= 7/3x-7-4/3x-8
= x-15
D= (x+5)(x+2)
= x²+2x+5x+10
= x²+7x+10
E= (5/3x+6/5)(5/6x+3)
= 25/18x²+5x+x+18/5
= 25/18x²+6x+18/5
F= (2x-4)(3x+5)-(4x-3)(7x+1)
= 6x² +10x-12x-20
= 6x²-2x-20
G= (t-4)(6t+7)-(2t-5)(3t+8)-5t²+5(t+4)
= 6t²-11t-28-6t²-t+40-5t²+5t+20
= -5t²-7t+32
