ex1
1 d
2 b
3c
4 a
ex 2
1a et c
2 b et c
3 a et b
ex 3
a -2x+5-4x+3= - 6x+8
b -5x+4x+3= - x +3
c x²+x+3x+5x²+1=6x²+4x+1
d 6x²-3+5x-7x²+4-2x = -x² + 3x +1
e -2x*3x+2x+3x²-4 = - 6x²+3x²+2x-4= - 3x²+2x-4
f 2*(3x²)-(4x)*x+x² =6x² -4x²+x² = 3x²
ex4
a 3x+5x*(-2x)+x*2=3x -10x²+2x=5x -10 x²
b 2+3*4-x-x =2+12-2x=14 - 2x
c - x*-x +(-x)*x =x²-x²=0
d -3*2+(x*5)*3+x*2x= - 6 +15x+2x²
