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=2√6 + √81√6 - 20
=2√6 + 9√6 - 20
=11√6 - 20
2.(√5 - 2√3)²= 5-2√15-2√15+12
=5-4√15+12
3.(√2-√3)√2-5√3)
=2 -5√6-√6+15
=17-6√6