Tìm lim \(u_n\)  biết \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maayaaabaWaaOaaaeaacaaIYaWa % aOaaaeaacaaIYaGaaiOlaiaac6cacaGGUaWaaOaaaeaacaaIYaaale % qaaaqabaaabeaaaeaacaWGUbGaaeiiaiaabsgacaqGHbGaaeyDaiaa % bccacaqGJbGaaeyyaiaab6gaaOGaayjo+daaaa!474E! {u_n} = \underbrace {\sqrt {2\sqrt {2...\sqrt 2 } } }_{n{\rm{ dau can}}}\)

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