Réponse :
5x+3-(2x-5)----->3x+8
x^2 -(3x-x^2)-----> 2x^2 -3x
4x^2 +2-(7x^2 +3)------> -3x^2 -1
8x+5-(3x+7)------> 5x-2
Explications étape par étape :
5x+3-(2x-5)= 5x+3-2x+5=3x+8
x^2 -(3x-x^2)= x^2 -3x+x^2= 2x^2 -3x
4x^2 +2-(7x^2 +3)= 4x^2 +2 -7x^2 -3= -3x^2 -1
8x+5-(3x+7)=8x +5 -3x -7= 5x-2
