Odpowiedź:
1/(1-√2) = 1/(1-√2) × (1+√2)/(1+√2) =(1+√2) /(1-√2)(1+√2)=
=(1+√2)/[ 1²- (√2)²] = (1+√2)/(1-2) = (1+√2)/ (-1) = - 1 - √2
Odp.
1/(1-√2) = - 1 - √2
