Li kt Khi i th tn cng, bn c¨® th chn bng qun c¨´ng cht hoc qun ch. K nng chn sau ¨® b¨¤i quyt nh vic gi v¨¢n hay thua. Trung b¨¬nh mi v¨¢n c¨® 10 ¨C 15 lt tn cng. Bit khi n¨¤o n¨ºn , khi n¨¤o n¨ºn r¨²t th¨ºm l¨¤ yu t quan trng. C¨¢ch chi b¨¤i tn kh¨¦o l¨¦o gi¨²p kim so¨¢t nhp v¨¤ l¨¤m kh¨® i th, tng t l thng ¨¢ng k. tim-hieu-xien-3-an-bao-nhieu Chia nh ngun vn K¨¨o cc chp l¨¤ loi k¨¨o ph bin tip theo trong c¨¢ cc ¨¢ g¨¤ ca st Lu c bit cn bit khi d¨´ng c¨¢c tool t¨¤i xu l¨¤ g¨¬? K¨¨o t¨¤i xu n.75 hay n 3/4 hoc n.5 ¨C n + 1 Cc tr¨ºn/ di si¨ºu hp dn Dy l chn 20 s: 02, 04, 12, 14, 18, 20, 22, 24, 28, 32, 36, 44, 50, 52, 54, 68, 62, 72, 74 v¨¤ 80. Nm chc c¨¢c lut v¨¤ quy tc chi trong t cc k¨¨o xi¨ºn Mt v¨¤i k¨¨o th b¨®ng ¨¢ ph bin nht th trng Mc Lc

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