Sagot :
Réponse:
1) x^2 + 3x -3x -9 = x^2 -9
2) x^2 + 10x -10x - 100 = x^2 -100
3) 81 + 9y - 9y - y^2 = - y^2 + 81
4) a^2 + ab -ba -b^2 = a^2 + b^2
Réponse:
1) x^2 + 3x -3x -9 = x^2 -9
2) x^2 + 10x -10x - 100 = x^2 -100
3) 81 + 9y - 9y - y^2 = - y^2 + 81
4) a^2 + ab -ba -b^2 = a^2 + b^2