Theo ¨®, t l o¨¢n tr¨²ng 1 l x s min bc l¨¤ 1 ¨C 0,7623 = 0,2376. Tng ng vi 23,76%. Anh em khi v¨¤o tin t cc n¨ºn ch¨² n con s n¨¤y. C¨¢ch t¨ªnh d¨¤n theo chn l, u ui s 6 l¨¢ c¨´ng cht. Cc ba: Khi bn d o¨¢n rng 3 mt x¨ª ngu ging nhau th¨¬ t v¨¤o ca n¨¤y. Vi 100 im tin vn khi thng thu v 15000 tin li. Mo chi t¨¤i xu cho ngi mi l¨¤ n¨ºn tr¨¢nh ca n¨¤y. Chi k¨º khu vc min Bc Khi chn loi k¨¨o n¨¤y, ngi chi cn tin h¨¤nh d o¨¢n v¨¤ t cc cho mt lt ¨¢ c th trong trn lun lu. Vi h¨¬nh thc n¨¤y ngi chi cn t¨¬m hiu k th t ¨¢ ca tng cu th a ra la chn tt nht. y l¨¤ loi k¨¨o cc ph bin nht bi n¨® ph¨´ hp vi mi i tng k c nhng ngi mi tham gia chi ln u. ¨¢nh d¨¤n ph bin ti u c¨¢ch c¨¢ cc b¨®ng r, cn xy dng chin lc da tr¨ºn d liu v¨¤ t duy phn t¨ªch. C¨¢c yu t quan trng bao gm: Bit c t l v¨¤ loi b c¨¢c con s khng cn thit Qu¨¢ tin v¨¤o i ca tr¨ºn R¨²t ra quy lut ¨¢nh b¨¤i t lch s c¨¢c v¨¢n trc ¨® Khi bn mun chi d¨¤n 36 s mi ng¨¤y th¨¬ n¨ºn ¨¢p dng c¨¢c s chn v¨¤ b nhng s l v¨¤ k¨¦p. Khi ¨® c hi ch¨²ng ta chin thng cng s cao hn n¨ºn bn c¨® th th nghim.

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