根号下6-根号35
=√[2×(6-√35)/2]
=√[﹙12-2√35)/2]
=√[(7-2×√7×√5+5)/2]
=√﹙√7-√5)²/2]
=﹙√7-√5﹚/2×√2
=﹙√14-√10)/2