Bonsoir
(7+2V3)² = 49 + (2V3)² + 2(14V3) = 49 + 12 + 28V3 = 61 + 28V3
(5-3V2)² = 25 + (3V2)² -2(15V2) = 25 +18 - 30V2 = 43 - 30V2
(3V7 + 4)² = (3V7)² + 16 + 2(12V7) = 63 + 16 + 24V7 = 79 + 24V7
donc
a = V(79+24V7) = V(3V7+4)² = 3V7 + 4
b = V(43-30V2) = V(5-3V2)² = 5 - 3V2
c = V(61+28V3) = V( 7+2V3)² = 7+2V3
