1 1 2√7+1 -2√7 +1 2
________ __ _________=_________________= ___________=
2√7 -1 2√7 +1 (2√7-1)(2√7+1) (2√7)² -1²
2
=_____= 2/27
28-1
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1 1 2√7+1 -2√7 +1 2
________ __ _________=_________________= ___________=
2√7 -1 2√7 +1 (2√7-1)(2√7+1) (2√7)² -1²
2
=_____= 2/27
28-1