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L: (4√10-4√6+√15*10-√15*6)×√4-√15 =
(4√10-4√6+√150-√90)×√4-√15=
(4√10-4√6+√25*6-√9*10)×√4-√15=
(4√10-4√6+5√6-3√10)×√4-√15=
(√10+√6)×√4-√15=
2√10+2√6-√15 = 2(√10+√6)-√15≈
2(3,16+2,44)-3,87≈