Exercice 1 :
1) je te laisse Verifier avec ta calculatrice
2) calculs :
A = [(2-V3)+(2+V3)]/[(2+V3)(2-V3)]
A = (2-V3+2+V3)/(4-2V3+2V3+3)
A = 4 / 7
A = 0,571...
B = (3V2)^2 - 2*3V2*V3 + (V3)^2 + 6V6
B = (9*2) - 6V6 + 3 + 6V6
B = 18 + 3
B = 21
Exercice 2 :
Factoriser :
70a - 21 = (7*10)a - (7*3)
70a - 21 = 7(10a - 3)
12x^2 + 16 = (3*4)x^2 + 4*4
12x^2 + 16 = 4(3x^2 + 4)
9x^2 - 3x + 6 = 3(3x^2-x+2)
x^2 - 4x = x(x - 4)
18b^4 - 18b^2 = 18b^2(b^2 - 1)
10x^3 + 5x = 5x(2x^2 + 1)
