a) √12 =√(4*3) = √4 * √3 = 2 * √3 = 2√3
b) √27= √(9*3)= √9 * √3 = 3 * √3 = 3√3
c) √32= √(8*4) = √(2*4) *√4 = √2 * √4 * √4 = √2 * 2 * 2 = 4√2
d) √256= √(8*32) = √(2*4) * 4√2 (voir c) = √2 *2 *4√2 = √2 (2*4) = 8√2
e) √18 = √(2*9) = √2 * √9 = √2 * 3 = 3√2
f) √550 = √(22*25) = √22 * √25 = √22 * 5 = 5√22
g) √75= √(3*25) = √3 * √25 = √3 * 5 = 5√3
h) √504= √(126*4) = √(14*9) * √4 = √14 * √9 * √4 = √14 * 3 * 2 = 6 * √14 = 6√14