Bonjour quelqu’un pourrait m’aider pour l’exercice 2 et 1 svp merci d’avance

Bonjour,

Exercice 1 :
x < x² sur ]-∞;0[∪]1;+∞[
x > x² sur ]0;1[
x = x² sur {0;1}

Exercice 2 :
A = 2/√3 = 2*1/√3 = (2√3)/3
B = -(√324)/3 = -(√(9*36))/3 = -(√9*√36)/3 = -(3√36)/3 = -√36
C = 4/(√2-1) = 4(√2+1)/((√2-1)(√2+1)) = (4√2+4)/(2-1) = 4√2+4
D = (√3)/(√3-1) = (√3)(√3+1)/((√3-1)(√3+1)) = (3+√3)/(3-1) = (3+√3)/2
E = ((3/4)-√3)(-√3+4) = -((3√3)/4)+3+3+4√3 = -((3√3)/4)+6+4√3 = -((3√3)/4)+(24/4)+((16√3)/4) = (-3√3+24+16√3)/4 = (24+13√3)/4