Ex. 4 :
1)
si x=√2
A = 8/(√2)² = 8/2 = 4
B = 4(√2)² = 4(2) = 8
C = -2(√2)² = -2(2) = -4
2) 8 + (-4) = 4 donc B+C=A
Ex. :
(√12)² = 12
√26 × √26 = (√26)² = 26
(-√17)×(-√17) = (-√17)² = 17
(√25)×(-√25) = -(√25×√25) = -(√25)² = -25
(√9)² = 9
√(-11)² = √121 = 11
√(1/3) × √(1/3) = (√(1/3))² = 1/3
tu continues ?