usuń nie wymierność z mianownika:
√2/2√2-1=
=√2/ 2√2-1 * 2√2+1/2√2+1=
=4+√2/4-1=
=4+√2/3
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√2/2√2-1=
=√2/ 2√2-1 * 2√2+1/2√2+1=
=4+√2/4-1=
=4+√2/3