Sagot :
je suis pas sur de savoir mais la 1ére oui car sa fer x^2+x-x =x^2
x^2 -5x^2-3x^2=x2+ 10x^2+ 9x^2=19x^4 +x^2
et la derniere = x^2+2
ps sur de la 2eme
x^2 -5x^2-3x^2=x2+ 10x^2+ 9x^2=19x^4 +x^2
et la derniere = x^2+2
ps sur de la 2eme
f(x)=x(x+1)-x
f(x)=x^2 +x -x
f(x)=x^2
g(x)=-x^2 +5x^2-3x^2
g(x)=x^2(-1+5-3)
g(x)=x^2(1)
g(x)=x^2
h(x)=(x-1)^2 +2x -1
h(x)=(x-1)(x+1) +2x-1
h(x)=x^2 -2x +1 +2x-1
h(x)=x^2
f(x)=x^2 +x -x
f(x)=x^2
g(x)=-x^2 +5x^2-3x^2
g(x)=x^2(-1+5-3)
g(x)=x^2(1)
g(x)=x^2
h(x)=(x-1)^2 +2x -1
h(x)=(x-1)(x+1) +2x-1
h(x)=x^2 -2x +1 +2x-1
h(x)=x^2