usuń nie wymierność z mianownika:
√2/2√2-1=
√2/2√2-1=√2*(2√2+1)/(2√2-1)*(2√2+1)= (4 + √2)/9
√2÷√2
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√2/2√2-1=√2*(2√2+1)/(2√2-1)*(2√2+1)= (4 + √2)/9
√2÷√2