L\u00f4 xi\u00ean c\u0169ng l\u00e0 m\u1ed9t c\u00e1ch gi\u1ea3i tr\u00ed b\u00e0i b\u1ea1c m\u00e0 l\u01b0\u1ee3ng ng\u01b0\u1eddi ch\u01a1i v\u00f4 c\u00f9ng l\u1edbn. Nhi\u1ec1u ng\u01b0\u1eddi trong s\u1ed1 h\u1ecd c\u00f3 gi\u1ea5c m\u1ed9ng \u0111\u1ed5i \u0111\u1eddi nh\u1edd nh\u1eefng con s\u1ed1 v\u00e0 thay \u0111\u1ed5i v\u1eadn m\u1ec7nh th\u1eadt nhanh ch\u00f3ng. V\u1eady c\u00f2n bao nhi\u00eau ng\u01b0\u1eddi ch\u01b0a hi\u1ec3u r\u00f5 l\u00f4 xi\u00ean l\u00e0 g\u00ec? Hay nh\u1eefng kinh nghi\u1ec7m \u0111\u00e1nh l\u00f4 xi\u00ean mi\u1ec1n B\u1eafc? N\u1ebfu ch\u01b0a h\u00e3y \u0111\u1ecdc ngay b\u00e0i vi\u1ebft n\u00e0y khi nh\u00ecn th\u1ea5y n\u00f3.<\/p>\n
1.L\u00f4 xi\u00ean l\u00e0 g\u00ec?<\/h2>\n
L\u00f4 xi\u00ean th\u1ef1c ch\u1ea5t v\u1eabn l\u00e0 m\u1ed9t ki\u1ec3u ch\u01a1i l\u00f4 nh\u01b0ng kh\u00e1c \u1edf ch\u1ed7, thay v\u00ec \u0111\u00e1nh m\u1ed9t con s\u1ed1 hay nhi\u1ec1u con s\u1ed1 ri\u00eang l\u1ebb c\u00f3 s\u1ef1 kh\u00e1c nhau. Ng\u01b0\u1eddi ch\u01a1i s\u1ebd th\u1eafng n\u1ebfu con s\u1ed1 \u0111\u00f3 tr\u00f9ng v\u1edbi con s\u1ed1 cu\u1ed1i c\u1ee7a c\u00e1 gi\u1ea3i ki\u1ebfn thi\u1ebft trong k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1. V\u1edbi l\u00f4 xi\u00ean ng\u01b0\u1eddi ch\u01a1i l\u1ea1i ch\u1ecdn 2 s\u1ed1 hay 3, th\u1eadm ch\u00ed l\u00e0 4 s\u1ed1, \u0111\u1ec3 d\u00e0nh chi\u1ebfn th\u1eafng th\u00ec 2, 3 hay 4 s\u1ed1 \u0111\u00f3 ph\u1ea3i ra c\u00f9ng m\u1ed9t l\u01b0\u1ee3t.<\/p>\n
C\u0169ng b\u1edfi vi\u1ec7c ch\u1ecdn s\u1ed1 l\u01b0\u1ee3ng s\u1ed1 kh\u00e1c nhau m\u00e0 c\u00e1ch t\u00ednh ti\u1ec1n l\u00f4 xi\u00ean c\u0169ng kh\u00e1c nhau, t\u00f9y thu\u1ed9c v\u00e0o s\u1ed1 l\u01b0\u1ee3ng s\u1ed1 ng\u01b0\u1eddi ch\u01a1i ch\u1ecdn. C\u00e0ng nhi\u1ec1u s\u1ed1, n\u1ebfu th\u1eafng ti\u1ec1n \u0111\u01b0\u1ee3c c\u00e0ng nhi\u1ec1u. B\u1edfi v\u1eady, ng\u01b0\u1eddi ch\u01a1i c\u00f3 c\u01a1 h\u1ed9i \u0111\u1ed5i \u0111\u1eddi hay thay \u0111\u1ed5i c\u1ea3 v\u1eadn m\u1ec7nh nh\u1edd l\u00f4 xi\u00ean.<\/p>\n
D\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1 ng\u01b0\u1eddi ch\u01a1i s\u1ebd t\u1ef1 bi\u1ebft m\u00ecnh c\u00f3 tr\u00fang hay kh\u00f4ng khi ch\u01a1i l\u00f4 xi\u00ean. Th\u00f4ng th\u01b0\u1eddng, th\u1eddi gian \u0111\u1eb7t ti\u1ec1n \u0111\u00e1nh l\u00f4 xi\u00ean hay l\u00f4 \u0111\u1ec1 l\u00e0 18h t\u1ed1i. N\u00f3i \u0111\u00fang h\u01a1n, qua 18h t\u1ed1i kh\u00f4ng c\u00f3 ai ghi th\u00eam l\u00f4 hay \u0111\u1ec1 v\u00e0 t\u1edbi 18h30 s\u1ebd c\u00f3 k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1 c\u00f4ng b\u1ed1.<\/p>\n
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2. L\u00f4 xi\u00ean 1 \u0103n bao nhi\u00eau?<\/h2>\n
Trong c\u00e1c h\u00ecnh th\u1ee9c l\u00f4 \u0111\u1ec1 ngo\u00e0i \u0111\u1ec1 ra th\u00ec l\u00f4 xi\u00ean \u0111\u01b0\u1ee3c coi l\u00e0 \u0103n ti\u1ec1n nhi\u1ec1u nh\u1ea5t. Nh\u1edd v\u1eady m\u00e0 nhi\u1ec1u ng\u01b0\u1eddi \u00f4m gi\u1ea5c m\u1ed9ng \u0111\u1ed5i \u0111\u1eddi nh\u1edd nh\u1eefng con s\u1ed1. K\u1ebft qu\u1ea3 l\u00f4 xi\u00ean h\u00f4m nay s\u1ebd chi ph\u1ed1i t\u1ec9 l\u1ec7 \u0103n th\u01b0\u1edfng nh\u01b0 xi\u00ean 2, xi\u00ean 3 hay xi\u00ean 4 c\u1ee5 th\u1ec3:<\/p>\n
H\u00ecnh th\u1ee9c l\u00f4 xi\u00ean 2: Ng\u01b0\u1eddi ch\u01a1i s\u1ebd b\u1ecdn 2 s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1 \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh t\u1eeb 00 \u0111\u1ebfn 99. K\u1ebft qu\u1ea3 s\u1ebd d\u1ef1a v\u00e0o c\u00e1c s\u1ed1 cu\u1ed1i c\u1ee7a c\u00e1c gi\u1ea3i. N\u1ebfu nh\u01b0 c\u00f3 2 s\u1ed1 tr\u00f9ng v\u1edbi s\u1ed1 ng\u01b0\u1eddi ch\u01a1i ch\u1ecdn ngh\u0129a l\u00e0 \u0111\u00e3 tr\u00fang l\u00f4 xi\u00ean 2. T\u1ec9 l\u1ec7 \u0103n 1\/10, n\u1ebfu \u0111\u00e1nh 1 \u0111\u1ed3ng th\u00ec \u0103n 10 \u0111\u1ed3ng.<\/p>\n
H\u00ecnh th\u1ee9c l\u00f4 xi\u00ean 3: V\u1eady l\u00f4 xi\u00ean quay 3 \u0103n bao nhi\u00eau? L\u00f4 xi\u00ean 3 s\u1ebd c\u00f3 c\u00e1ch t\u00ednh \u0103n 1\/40. N\u1ebfu \u0111\u00e1nh 1 \u0111\u1ed3ng th\u00ec \u0103n 40 \u0111\u1ed3ng.<\/p>\n
H\u00ecnh th\u1ee9c l\u00f4 xi\u00ean 4: \u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c t\u1ec9 l\u1ec7 \u0103n cao nh\u1ea5t 1\/100 th\u1ebf nh\u01b0ng b\u1ea1n ph\u1ea3i ch\u1ecdn \u0111\u00fang 4 con s\u1ed1 c\u00f3 2 s\u1ed1 cu\u1ed1i c\u00e1c gi\u1ea3i tr\u00f9ng nhau.<\/p>\n
Tuy t\u1ec9 l\u1ec7 tr\u00fang kh\u00e1 kh\u00f3 nh\u01b0ng l\u01b0\u1ee3ng ng\u01b0\u1eddi ch\u01a1i l\u1ea1i r\u1ea5t nhi\u1ec1u \u0111\u1ee7 cho th\u1ea5y m\u1ee9c \u0103n ti\u1ec1n c\u1ee7a l\u00f4 xi\u00ean r\u1ea5t l\u1edbn.<\/p>\n
3. Kinh nghi\u1ec7m \u0111\u00e1nh l\u00f4 xi\u00ean mi\u1ec1n B\u1eafc<\/h2>\n
Kh\u00f4ng ph\u1ea3i ng\u1eabu nhi\u00ean b\u1ea1n l\u1ef1a ch\u1ecdn c\u00e1c con s\u1ed1 trong l\u00f4 xi\u00ean, m\u1ecdi th\u1ee9 c\u1ea7n tu\u00e2n theo c\u00e1c quy lu\u1eadt hay c\u00e1c kinh nghi\u1ec7m ng\u01b0\u1eddi tr\u01b0\u1edbc \u0111\u1ec3 l\u1ea1i. Kinh nghi\u1ec7m \u0111\u00e1nh l\u00f4 xi\u00ean mi\u1ec1n B\u1eafc c\u0169ng c\u00f3 nhi\u1ec1u lo\u1ea1i.<\/p>\n
a. B\u1ea1n ph\u1ea3i bi\u1ebft c\u00e1ch t\u00ednh x\u00e1c su\u1ea5t l\u00f4 xi\u00ean<\/h3>\n
Vi\u1ec7c t\u00ecm ra con s\u1ed1 may m\u1eafn s\u1ebd d\u1ec5 d\u00e0ng h\u01a1n r\u1ea5t nhi\u1ec1u n\u1ebfu b\u1ea1n n\u1eafm r\u00f5 x\u00e1c su\u1ea5t \u0111\u00e1nh l\u00f4 xi\u00ean. K\u1ebft qu\u1ea3 l\u00f4 xi\u00ean th\u1ef1c ch\u1ea5t l\u00e0 c\u00e1c con s\u1ed1 cu\u1ed1i c\u1ee7a 27 gi\u1ea3i th\u01b0\u1edfng. Nh\u01b0 v\u1eady, v\u1edbi 100 s\u1ed1 t\u1eeb 00 \u0111\u1ebfn 99 ta s\u1ebd ph\u1ea3i ch\u1ecdn ra 27 s\u1ed1 v\u1edbi t\u1ec9 l\u1ec7 21,5%.<\/p>\n
N\u00f3i c\u00e1ch kh\u00e1c th\u00ec c\u1ee9 5 s\u1ed1 tr\u00ean c\u00f3 ch\u1eafc 1 s\u1ed1 tr\u00fang, v\u1eady n\u00ean khi \u0111\u00e1nh l\u00f4 xi\u00ean b\u1ea1n ch\u1ec9 c\u1ea7n nh\u00e2n x\u00e1c xu\u1ea5t \u0111\u00f3 theo t\u1ec9 l\u1ec7:<\/p>\n
L\u00f4 xi\u00ean 3 th\u00ec nh\u00e2n 3 theo c\u00f4ng th\u1ee9c 21,5 % x 21,5% x 21,5% = 0,00994 => x\u00e1c su\u1ea5t tr\u00fang d\u01b0\u1edbi1% (0,994%).<\/p>\n
L\u00f4 xi\u00ean nh\u00e2n 4 l\u1ea7n: 21,5 % x 21,5% x 21,5% x 21,5% => k\u1ebft qu\u1ea3 r\u1ea5t nh\u1ecf kh\u00f3 h\u01a1n c\u1ea3 \u0111\u00e1nh \u0111\u1ec1.<\/p>\n
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b. N\u1eafm \u0111\u01b0\u1ee3c c\u00e1c con s\u1ed1 n\u00e0o hay c\u00f9ng nhau ra nh\u1ea5t<\/h3>\n
C\u00e1ch \u0111\u00e1nh l\u00f4 xi\u00ean 4 hay xi\u00ean 3 xi\u00ean 2 c\u0169ng c\u1ea7n n\u1eafm \u0111\u01b0\u1ee3c c\u00e1c con s\u1ed1 hay ra c\u00f9ng nhau. N\u00f3 \u0111\u01b0\u1ee3c \u0111\u00fac r\u00fat t\u1eeb nh\u1eefng ng\u01b0\u1eddi ch\u01a1i l\u00e2u n\u0103m. N\u1ebfu mu\u1ed1n b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c c\u1eb7p s\u1ed1 hay ra c\u00f9ng nhau b\u00ean d\u01b0\u1edbi.<\/p>\n
C\u00e1c c\u1eb7p l\u00f4 xi\u00ean th\u01b0\u1eddng ra nh\u01b0 565 \u2013 373 \u2013 79 \u2013 92 \u2013 75.<\/p>\n
C\u00e1c c\u1eb7p l\u00f4 xi\u00ean hay \u0111i v\u1edbi nhau nh\u01b0 373 \u2013 010, 52 \u2013 22, 11 \u2013 44, 76 \u2013 47 hay 25 \u2013 22.<\/p>\n
N\u1ebfu h\u00f4m tr\u01b0\u1edbc ra c\u1eb7p 060 h\u00f4m sau ch\u1eafc ch\u1eafn s\u1ebd c\u00f3 1 con v\u1ec1.<\/p>\n
H\u00f4m nay l\u00f4 ra 51 r\u1ea5t c\u00f3 th\u1ec3 h\u00f4m sau ra 15<\/p>\n
H\u00f4m nay ra c\u1ea3 c\u1eb7p 050 h\u00f4m sau s\u1ebd tr\u1ea3 l\u1ea1i 1 con<\/p>\n
H\u00f4m nay c\u00f3 c\u1eb7p 020 h\u00f4m sau s\u1ebd c\u00f3 con 99 v\u00e0 con ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
N\u1ebfu l\u00f4 75 h\u00f4m tr\u01b0\u1edbc th\u00ec h\u00f4m sau c\u00f3 con l\u00f4 57<\/p>\n
N\u1ebfu h\u00f4m nay \u0111\u1ea7u 7, l\u00f4 \u0111\u00edt 3 c\u00e2m, ng\u00e0y mai s\u1ebd c\u00f3 th\u1ec3 c\u00f3 con l\u00f4 73<\/p>\n
H\u00f4m nay l\u00f4 97 ng\u00e0y mai c\u00f3 con l\u00f4 3 c\u00e0ng 373<\/p>\n
L\u00f4 97 th\u01b0\u1eddng v\u1ec1 v\u00e0o th\u1ee9 5 v\u00e0 th\u1ee9 7<\/p>\n
Con l\u00f4 33 hay ra v\u00e0o th\u1ee9 2, 3, 7 v\u00e0 ch\u1ee7 nh\u1eadt<\/p>\n
H\u00f4m nay ra con 68 h\u00f4m sau s\u1ebd v\u1ec1 con l\u00f4 86<\/p>\n
Nhi\u1ec1u ng\u01b0\u1eddi cho r\u1eb1ng, khi c\u00f3 d\u00e3y l\u00f4 xi\u00ean nh\u01b0ng kh\u00f4ng li\u00ean ti\u1ebfp nh\u01b0: 01 \u2013 02 \u2013 03 \u2013 04 \u2013 06 th\u00ec t\u1ec9 l\u1ec7 h\u00f4m sau c\u00f3 con 05 v\u1ec1 l\u00e0 r\u1ea5t cao.<\/p>\n
Hi v\u1ecdng, v\u1edbi nh\u1eefng kinh nghi\u1ec7m ch\u01a1i l\u00f4 xi\u00ean mi\u1ec1n B\u1eafc m\u00e0 ch\u00fang t\u00f4i s\u01b0u t\u1ea7m \u0111\u01b0\u1ee3c s\u1ebd gi\u00fap c\u00e1c b\u1ea1n ch\u1ecdn \u0111\u01b0\u1ee3c nh\u1eefng c\u1eb7p l\u00f4 xi\u00ean \u0111\u00e0o ra ti\u1ec1n. N\u1ebfu b\u1ea1n l\u00e0 ng\u01b0\u1eddi m\u1edbi ch\u01a1i, h\u00e3y tham kh\u1ea3o th\u1eadt k\u1ef9 b\u00e0i vi\u1ebft n\u00e0y.<\/p>\n<\/div>\n<\/div>\n