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= 5 + 2√6
14) (3√5 - 2√3)(2√4 + √6) = 12√5 + 3√30 - 8√3 - 6√2
15) (√6 + √5)(√6 - √5) = 6 - 5 = 1
31) 5/√5 * √5/√5 = (1/5)√5
32) 100/4√10 = 25/√10 * √10/√10
= (5/2)√10