bonjour

ex 1

a =x+x=2x

b=x×x=x²

c=2x+x=3x

d=3x+2

e=2x×x=2x²

f=x²+x

g=0×x=0

h=1+2x

0+x=x

j=5x×6x=30x²

k=4×x×5=20x

i=x×x+x=x²+x

ex2

a=12x-4+2=12x-6

b=7y+12-13y=-6y+12

c=10-8d+3=-8d+13

d=8-x+x²+5x=x²+4x+8

e=3t-12t+t²-7=t²-9t-7

f=a²+b-a+3b=a+4b