C¨¢c thit b ti¨ºu chun ca 1 b li, bao gm kp b¨¤n, li, dy cng v¨¤ cc li. Nm r kh¨¢i nim v t qu v¨¤ 3 i thng Bc nh l ¨¢p dng cho x¨¢c sut thng k¨º, c¨¢ch t¨ªnh to¨¢n theo to¨¢n hc x¨¢c sut.C¨¢c con l tr¨²ng thng s khng xut hin ngu nhi¨ºn. ¨C u 2: 20, 24, 26, 28 Nu bn thy t l k¨¨o bin ng, thay i qu¨¢ nhiu. y l¨¤ nhng t l k¨¨o khng c an to¨¤n. Nu mc cc qu¨¢ cao, qu¨¢ hp dn, ¨® c¨® th l¨¤ mt by d nh¨¤ c¨¢i a ra nh ngi chi. Tt nhi¨ºn rng, cng s c¨® nhng trn u c¨® k¨¨o thm. phn bit 2 k¨¨o n¨¤y, hy cn c v¨¤o t¨¬nh h¨¬nh trn u v¨¤ phong ca c 2 i. Khi anh em a ra quyt nh s cc xi¨ºn 3 chn tr l¨ºn, ngo¨¤i vic t xi¨ºn ch¨ªnh, nh¨¤ c¨¢i cng s cho ph¨¦p bn t l¨ºn tt c xi¨ºn s xut hin t ch¨ªnh k¨¨o c chn. C¨® th d¨´ng nhiu t¨¤i khon? Snh: 5 l¨¢ li¨ºn tip, khng bt buc ch¨²ng phi c¨´ng cht. Chin lc 1: Ch¨²ng ta c¨® th da v¨¤o kt qu x s k khui thng trc kia. T ¨® m¨¤ a ra nhng quyt nh thng minh, chun x¨¢c nng cao t l thng. Vy chn l¨¤ yu t quan trng ¨¢nh gi¨¢ mt chin k¨º cht lng. Mt s loi vy him, c nhiu ngi sn l¨´ng nh vy ng qu, ¨¢n thi¨ºn, h¨¤m long, ph a u l¨¤ du hiu ca nhng thn k¨º thc th. Nhng chin k¨º s hu loi vy n¨¤y thng c¨® sc chin u mnh m, tung ra nhng c¨² ¨¢ him h¨®c, y uy lc. CSN02 Thng lin thng m tng 2,888,000 Mt trong nhng yu t quyt nh th¨¤nh bi khi chi ¨¢ g¨¤ Thomo l¨¤ chn chin k¨º. G¨¤ khe, k nng tt s gi¨²p ngi t cc c¨® li th. Ngi chi n¨ºn quan s¨¢t d¨¢ng ng, mt v¨¤ chn g¨¤. G¨¤ c¨® d¨¢ng vng, mt s¨¢ng v¨¤ chn chc thng thi u bn b hn. Ngo¨¤i ra, lng g¨¤ ¨®ng mt cng th hin sc khe tt.

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