T qu c¨® cht c 3 i thng khng? Kinh nghim soi cu x s theo l ri Vn cc l¨¤ iu kin ti¨ºn quyt: chi l hiu qu, bn cn c¨® mt khon vn n nh nhng cn thn tr¨¢nh vay mn. Vic gii hn sc mnh ca b 4 l¨¢ trc 3 con 2 nhm m bo t¨ªnh cn bng cho v¨¢n b¨¤i, tr¨¢nh trng hp mt ngi chi s hu b 4 l¨¢ c¨® th chim u th qu¨¢ ln v¨¤ d d¨¤ng gi¨¤nh chin thng. Mt v¨¤i k¨¨o th b¨®ng ¨¢ ph bin nht th trng Hc hi th¨ºm nhiu kin thc t c¨¢c cc th ni ting Ti sao k¨¨o chu lun hp dn c nhiu bet th? T qu vi 4 i thng khng th¨¬ c¨¢i n¨¤o hn? Kt lun Chiu d¨¤i: Li k¨¦o d¨¤i to¨¤n b chiu rng ca b¨¤n (1,525m) c cng ngang gia b¨¤n, phn nh ra mi b¨ºn ch khong 15,25 cm. Kh¨¢i qu¨¢t v c¨¢ch c¨¢ cc b¨®ng r 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.

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