Question

m= (3+√13)/2 请计算m2-（1/m2)

Answer 1

1/m=2/ (3+√13)=2* (√13-3)/[ (3+√13)* (√13-3)]=(√13-3)/2

m^2-1/(m^2)=(m-1/m)(m+1/m)=3*√13=3√13