(17+2√30)(√15 -√2) 17√15-17√2+30√2-4√15
=_______________________=______________________=
(√15+√2)(√15-√2) (√15)² -(√2)²
13√15+13√2 13(√15+√2)
=___________=________________=√15+√2
15-2 13
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(17+2√30)(√15 -√2) 17√15-17√2+30√2-4√15
=_______________________=______________________=
(√15+√2)(√15-√2) (√15)² -(√2)²
13√15+13√2 13(√15+√2)
=___________=________________=√15+√2
15-2 13
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