T\u00f4i mu\u1ed1n h\u1ecfi li\u1ec7u c\u00f4ng th\u1ee9c \u0111\u1ecbnh lu\u1eadt Hooke F=kx c\u00f3 \u0111\u00fang v\u1edbi tr\u01b0\u1eddng h\u1ee3p l\u00f2 xo h\u00ecnh n\u00f3n kh\u00f4ng hay c\u00f3 m\u1ed9t s\u1ed1 thay \u0111\u1ed5i trong c\u00f4ng th\u1ee9c?
Th\u1ee9 hai, b\u1ea1n c\u00f3 th\u1ec3 gi\u1edbi thi\u1ec7u 1 ti\u00eau chu\u1ea9n ho\u1eb7c cu\u1ed1n s\u00e1ch n\u00e0o \u0111\u1ec3 gi\u00fap t\u00f4i c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 thi\u1ebft k\u1ebf v\u00e0 c\u00f4ng th\u1ee9c c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>\n\n\n\n
C\u1ea3m \u01a1n c\u00e2u h\u1ecfi c\u1ee7a b\u1ea1n. V\u1edbi l\u00f2 xo h\u00ecnh n\u00f3n, kh\u00f4ng c\u00f3 kh\u00e1i ni\u1ec7m h\u1eb1ng s\u1ed1 l\u00f2 xo (k) sau khi l\u00f2 xo \u0111\u1ea1t \u0111\u1ebfn \u0111\u1ed9 cao khi b\u1ecb n\u00e9n t\u1ed1i \u0111a do chi\u1ec1u cao n\u00e0y thay \u0111\u1ed5i. Tuy nhi\u00ean, c\u00f3 m\u1ed9t c\u00f4ng th\u1ee9c chung \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1ea3i tr\u1ecdng c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n. Vui l\u00f2ng xem th\u00eam c\u00f4ng th\u1ee9c \u0111\u00ednh k\u00e8m b\u00ean d\u01b0\u1edbi.<\/p>\n\n\n\n
https:\/\/www.tokaibane.com\/en\/cms\/wp-content\/uploads\/2021\/03\/20210315-Conical-spring.pdf<\/p>\n\n\n\n
N\u1ebfu b\u1ea1n c\u00f3 b\u1ea5t k\u1ef3 c\u00e2u h\u1ecfi n\u00e0o kh\u00e1c, xin vui l\u00f2ng cho ch\u00fang t\u00f4i bi\u1ebft b\u1ea5t c\u1ee9 l\u00fac n\u00e0o.
Tr\u00e2n tr\u1ecdng,<\/p>\n\n\n\n
L\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo quy lu\u1eadt Hooke trong ph\u1ea1m vi t\u1ea3i tr\u1ecdng r\u1ed9ng nh\u1ea5t khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u1ea7u c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01b0\u1edbng xu\u1ed1ng. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao ch\u00fang \u0111\u01b0\u1ee3c l\u00e0m theo c\u00e1ch \u0111\u00f3. Gi\u1ea3i th\u00edch t\u1ea1i sao.<\/p>\n\n\n\n
L\u00e0m th\u1ebf n\u00e0o ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c chi\u1ec1u cao khi b\u1ecb n\u00e9n t\u1ed1i \u0111a c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n? \u0110\u1ed1i v\u1edbi l\u00f2 xo n\u00e9n Lf=Nt x d<\/p>\n\n\n\n
Trong \u0111\u00f3: Lf= Chi\u1ec1u d\u00e0i t\u1ef1 do<\/p>\n\n\n\n
Nt= T\u1ed5ng s\u1ed1 cu\u1ed9n d\u00e2y<\/p>\n\n\n\n
d= \u0111\u01b0\u1eddng k\u00ednh d\u00e2y<\/p>\n\n\n\n
Ch\u00fang t\u00f4i xin l\u1ed7i v\u00ec \u0111\u00e3 tr\u1ea3 l\u1eddi mu\u1ed9n. Vui l\u00f2ng t\u00ecm c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a ch\u00fang t\u00f4i trong file \u0111\u00ednh k\u00e8m.<\/p>\n\n\n\n
Ch\u00fang t\u00f4i hy v\u1ecdng b\u1ea1n th\u1ea5y n\u00f3 h\u1eefu \u00edch. N\u1ebfu b\u1ea1n c\u00f3 b\u1ea5t k\u1ef3 c\u00e2u h\u1ecfi n\u00e0o kh\u00e1c, xin vui l\u00f2ng cho ch\u00fang t\u00f4i bi\u1ebft.<\/p>\n\n\n\n
https:\/\/www.tokaibane.com\/en\/cms\/wp-content\/uploads\/2021\/03\/Conical-springs-solid-length.jpg<\/p>\n\n\n\n
Tr\u00e2n tr\u1ecdng,<\/p>\n\n\n\n
1) L\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo quy lu\u1eadt Hooke trong ph\u1ea1m vi t\u1ea3i tr\u1ecdng r\u1ed9ng nh\u1ea5t khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u1ea7u c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01b0\u1edbng xu\u1ed1ng. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao ch\u00fang \u0111\u01b0\u1ee3c l\u00e0m theo c\u00e1ch \u0111\u00f3. Gi\u1ea3i th\u00edch t\u1ea1i sao.<\/p>\n\n\n\n
2) M\u1ed9t s\u1ed1 l\u00f2 xo \u0111\u01b0\u1ee3c qu\u1ea5n b\u1eb1ng d\u00e2y xo\u1eafn \u0111\u1ec3 ch\u00fang b\u1ecb n\u00e9n ch\u1eb7t m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean. Bi\u1ec3u \u0111\u1ed3 \u0111\u1ed9 gi\u00e3n so v\u1edbi l\u1ef1c t\u00e1c d\u1ee5ng s\u1ebd cho th\u1ea5y \u0111i\u1ec3m ch\u1eb7n tr\u00ean tr\u1ee5c gi\u00e3n l\u00e0 \u00e2m, ngh\u0129a l\u00e0 ‘chi\u1ec1u d\u00e0i kh\u00f4ng gi\u00e3n’ ng\u1eafn h\u01a1n chi\u1ec1u d\u00e0i kh\u00f4ng t\u1ea3i th\u1ef1c t\u1ebf. Gi\u1ea3i th\u00edch.<\/p>\n\n\n\n
https:\/\/www.tokaibane.com\/en\/cms\/wp-content\/uploads\/2022\/02\/16448760394637537464774830368617-e1644997645381.jpg<\/p>\n\n\n\n
1) Ch\u00fang t\u00f4i s\u1ebd tr\u1ea3 l\u1eddi b\u1eb1ng c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m chung c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n.
Khi l\u00f2 xo h\u00ecnh n\u00f3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t h\u01b0\u1edbng xu\u1ed1ng v\u00e0 n\u00e9n t\u1eeb \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t, c\u00e1c cu\u1ed9n d\u00e2y \u1edf ph\u00eda \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t s\u1ebd v\u1eeba kh\u00edt b\u00ean trong \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t khi \u0111\u1ed9 n\u00e9n t\u0103ng l\u00ean.<\/p>\n\n\n\n
So s\u00e1nh l\u00f2 xo n\u00e9n v\u00e0 l\u00f2 xo h\u00ecnh n\u00f3n c\u00f3 c\u00f9ng ba y\u1ebfu t\u1ed1: \u0111\u01b0\u1eddng k\u00ednh d\u00e2y, chi\u1ec1u d\u00e0i t\u1ef1 do v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y, l\u00f2 xo h\u00ecnh n\u00f3n c\u00f3 th\u1ec3 n\u00e9n nhi\u1ec1u h\u01a1n cho \u0111\u1ebfn khi \u0111\u1ea1t chi\u1ec1u cao t\u1ed1i thi\u1ec3u v\u00ec l\u00fd do tr\u00ean. T\u00f9y thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng, th\u1eadm ch\u00ed c\u00f3 nh\u1eefng l\u00f2 xo h\u00ecnh n\u00f3n c\u00f3 h\u00ecnh d\u1ea1ng cho ph\u00e9p ch\u00fang b\u1ecb n\u00e9n \u0111\u1ebfn chi\u1ec1u cao t\u1ed1i thi\u1ec3u b\u1eb1ng \u0111\u01b0\u1eddng k\u00ednh d\u00e2y.M\u1ed1i quan h\u1ec7 gi\u1eefa t\u1ea3i tr\u1ecdng v\u00e0 \u0111\u1ed9 v\u00f5ng c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo \u0111\u1ecbnh lu\u1eadt Hooke P (t\u1ea3i tr\u1ecdng) = k (h\u1eb1ng s\u1ed1 l\u00f2 xo) \u00d7 \u03b4 (\u0111\u1ed9 bi\u1ebfn d\u1ea1ng), nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed1i quan h\u1ec7 tuy\u1ebfn t\u00ednh nh\u01b0 l\u00f2 xo n\u00e9n th\u00f4ng th\u01b0\u1eddng.L\u00fd do l\u00e0 khi b\u1ecb n\u00e9n, \u0111\u01b0\u1eddng k\u00ednh cu\u1ed9n d\u00e2y hi\u1ec7u d\u1ee5ng tr\u1edf n\u00ean nh\u1ecf h\u01a1n v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y ho\u1ea1t \u0111\u1ed9ng c\u0169ng gi\u1ea3m, do \u0111\u00f3 h\u1eb1ng s\u1ed1 l\u00f2 xo tr\u1edf n\u00ean l\u1edbn h\u01a1n.<\/p>\n\n\n\n
2) Ch\u00fang t\u00f4i s\u1ebd tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi n\u00e0y b\u1eb1ng c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a l\u00f2 xo k\u00e9o-m\u00f3c xo\u1eafn ch\u1eb7t c\u00f3 l\u1ef1c c\u0103ng ban \u0111\u1ea7u. Ch\u00fang l\u00e0 l\u00f2 xo k\u00e9o-m\u00f3c \u0111\u01b0\u1ee3c cu\u1ed9n v\u00e0 xo\u1eafn theo h\u01b0\u1edbng ng\u01b0\u1ee3c v\u1edbi h\u01b0\u1edbng xo\u1eafn t\u00e1c d\u1ee5ng l\u00ean d\u00e2y trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng.<\/p>\n\n\n\n
K\u1ebft qu\u1ea3 l\u00e0 xu\u1ea5t hi\u1ec7n l\u1ef1c c\u0103ng ban \u0111\u1ea7u trong l\u00f2 xo.L\u1ef1c c\u0103ng ban \u0111\u1ea7u l\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng theo h\u01b0\u1edbng h\u01b0\u1edbng v\u1ec1 tr\u1ea1ng th\u00e1i chi\u1ec1u d\u00e0i t\u1ed1i thi\u1ec3u ngay c\u1ea3 khi l\u00f2 xo \u1edf tr\u1ea1ng th\u00e1i t\u1ef1 do. Do \u0111\u00f3, ngay c\u1ea3 khi l\u00f2 xo gi\u00e3n b\u1ecb k\u00e9o, chi\u1ec1u d\u00e0i c\u1ee7a l\u00f2 xo v\u1eabn kh\u00f4ng \u0111\u1ed5i cho \u0111\u1ebfn khi l\u1ef1c c\u0103ng ban \u0111\u1ea7u v\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng c\u00e2n b\u1eb1ng.\u0110\u1ed1i v\u1edbi m\u1ed1i quan h\u1ec7 gi\u1eefa t\u1ea3i tr\u1ecdng v\u00e0 \u0111\u1ed9 bi\u1ebfn d\u1ea1ng, vui l\u00f2ng tham kh\u1ea3o Bi\u1ec3u \u0111\u1ed3 7 tr\u00ean trang n\u00e0y.
Tr\u1ee5c X l\u00e0 \u0111\u1ed9 bi\u1ebfn d\u1ea1ng v\u00e0 tr\u1ee5c Y l\u00e0 l\u1ef1c. Nh\u01b0 b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y, ngay c\u1ea3 khi tr\u1ee5c X (\u0111\u1ed9 bi\u1ebfn d\u1ea1ng) l\u00e0 0 mm, m\u1ed1i quan h\u1ec7 tuy\u1ebfn t\u00ednh b\u1eaft \u0111\u1ea7u t\u1eeb \u0111i\u1ec3m m\u00e0 n\u00f3 giao v\u1edbi tr\u1ee5c b\u00ean d\u01b0\u01a1ng v\u1edbi tr\u1ee5c Y (l\u1ef1c) (giao \u0111i\u1ec3m l\u00e0 d\u01b0\u01a1ng).
\u0110i\u1ec1u n\u00e0y kh\u00f4ng th\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c trong th\u1ef1c t\u1ebf, nh\u01b0ng n\u1ebfu \u0111\u1eb7c t\u00ednh tuy\u1ebfn t\u00ednh n\u00e0y \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng \u0111\u1ebfn ph\u00eda \u00e2m c\u1ee7a tr\u1ee5c X (\u0111\u1ed9 bi\u1ebfn d\u1ea1ng), th\u00ec giao \u0111i\u1ec3m v\u1edbi tr\u1ee5c X (\u0111\u1ed9 bi\u1ebfn d\u1ea1ng) s\u1ebd l\u00e0 s\u1ed1 \u00e2m.<\/p>\n\n\n\n
N\u00f3i c\u00e1ch kh\u00e1c, gi\u1ea3 s\u1eed t\u1ea3i tr\u1ecdng l\u00e0 0N, \u0111\u1ed9 bi\u1ebfn d\u1ea1ng l\u00e0 s\u1ed1 \u00e2m, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 hi\u1ec3u l\u00e0 “ng\u1eafn h\u01a1n chi\u1ec1u d\u00e0i t\u1ef1 do th\u1ef1c t\u1ebf”.
Tr\u00e2n tr\u1ecdng,<\/p>\n\n\n\n
L\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo quy lu\u1eadt Hooke trong ph\u1ea1m vi t\u1ea3i tr\u1ecdng r\u1ed9ng nh\u1ea5t khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u1ea7u c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01b0\u1edbng xu\u1ed1ng. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao ch\u00fang \u0111\u01b0\u1ee3c l\u00e0m theo c\u00e1ch \u0111\u00f3. Gi\u1ea3i th\u00edch t\u1ea1i sao.<\/p>\n\n\n\n
M\u1ed1i quan h\u1ec7 gi\u1eefa t\u1ea3i tr\u1ecdng v\u00e0 \u0111\u1ed9 v\u00f5ng c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo \u0111\u1ecbnh lu\u1eadt Hooke P (t\u1ea3i tr\u1ecdng) = k (h\u1eb1ng s\u1ed1 l\u00f2 xo) \u00d7 \u03b4 (\u0111\u1ed9 bi\u1ebfn d\u1ea1ng), nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed1i quan h\u1ec7 tuy\u1ebfn t\u00ednh nh\u01b0 l\u00f2 xo n\u00e9n th\u00f4ng th\u01b0\u1eddng.L\u00fd do l\u00e0 khi b\u1ecb n\u00e9n, \u0111\u01b0\u1eddng k\u00ednh cu\u1ed9n d\u00e2y hi\u1ec7u d\u1ee5ng tr\u1edf n\u00ean nh\u1ecf h\u01a1n v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y ho\u1ea1t \u0111\u1ed9ng c\u0169ng gi\u1ea3m, do \u0111\u00f3 h\u1eb1ng s\u1ed1 l\u00f2 xo tr\u1edf n\u00ean l\u1edbn h\u01a1n.Ch\u00fang t\u00f4i hy v\u1ecdng c\u00e2u tr\u1ea3 l\u1eddi n\u00e0y gi\u00fap \u00edch cho b\u1ea1n.
Tr\u00e2n tr\u1ecdng,<\/p>\n\n\n\n
H\u00e3y gi\u00fap t\u00f4i tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi s\u1ed1 3.<\/p>\n\n\n\n
https:\/\/www.tokaibane.com\/en\/cms\/wp-content\/uploads\/2022\/10\/image.jpg<\/p>\n\n\n\n
C\u1ea3m \u01a1n c\u00e2u h\u1ecfi c\u1ee7a b\u1ea1n!<\/p>\n\n\n\n
Tuy nhi\u00ean, v\u1edbi nh\u1eefng th\u00f4ng tin tr\u00ean, ch\u00fang t\u00f4i ch\u01b0a th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c \u00fd ngh\u0129a c\u1ee7a c\u00e2u h\u1ecfi. B\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch th\u00eam \u0111\u1ec3 ch\u00fang t\u00f4i c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 b\u1ea1n \u0111\u01b0\u1ee3c kh\u00f4ng?
Tr\u00e2n tr\u1ecdng,<\/p>\n\n\n\n
T\u1ea1i sao l\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo quy lu\u1eadt Hooke trong ph\u1ea1m vi t\u1ea3i tr\u1ecdng r\u1ed9ng nh\u1ea5t khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u1ea7u c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01b0\u1edbng xu\u1ed1ng?<\/p>\n\n\n\n
C\u1ea3m \u01a1n c\u00e2u h\u1ecfi c\u1ee7a b\u1ea1n!<\/p>\n\n\n\n
Ch\u00fang t\u00f4i s\u1ebd tr\u1ea3 l\u1eddi b\u1eb1ng c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m chung c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n.
Khi l\u00f2 xo h\u00ecnh n\u00f3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t h\u01b0\u1edbng xu\u1ed1ng v\u00e0 n\u00e9n t\u1eeb \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t, c\u00e1c cu\u1ed9n d\u00e2y \u1edf ph\u00eda \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t s\u1ebd v\u1eeba kh\u00edt b\u00ean trong \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t khi \u0111\u1ed9 n\u00e9n t\u0103ng l\u00ean. So s\u00e1nh l\u00f2 xo n\u00e9n v\u00e0 l\u00f2 xo h\u00ecnh n\u00f3n c\u00f3 c\u00f9ng ba y\u1ebfu t\u1ed1: \u0111\u01b0\u1eddng k\u00ednh d\u00e2y, chi\u1ec1u d\u00e0i t\u1ef1 do v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y, l\u00f2 xo h\u00ecnh n\u00f3n c\u00f3 th\u1ec3 n\u00e9n nhi\u1ec1u h\u01a1n cho \u0111\u1ebfn khi \u0111\u1ea1t chi\u1ec1u cao t\u1ed1i thi\u1ec3u v\u00ec l\u00fd do tr\u00ean.<\/p>\n\n\n\n
T\u00f9y thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng, th\u1eadm ch\u00ed c\u00f3 nh\u1eefng l\u00f2 xo h\u00ecnh n\u00f3n c\u00f3 h\u00ecnh d\u1ea1ng cho ph\u00e9p ch\u00fang b\u1ecb n\u00e9n \u0111\u1ebfn chi\u1ec1u cao t\u1ed1i thi\u1ec3u b\u1eb1ng \u0111\u01b0\u1eddng k\u00ednh d\u00e2y. M\u1ed1i quan h\u1ec7 gi\u1eefa t\u1ea3i tr\u1ecdng v\u00e0 \u0111\u1ed9 v\u00f5ng c\u1ee7a l\u00f2 xo h\u00ecnh n\u00f3n tu\u00e2n theo \u0111\u1ecbnh lu\u1eadt Hooke P (t\u1ea3i tr\u1ecdng) = k (h\u1eb1ng s\u1ed1 l\u00f2 xo) \u00d7 \u03b4 (\u0111\u1ed9 bi\u1ebfn d\u1ea1ng), nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed1i quan h\u1ec7 tuy\u1ebfn t\u00ednh nh\u01b0 l\u00f2 xo n\u00e9n th\u00f4ng th\u01b0\u1eddng. L\u00fd do l\u00e0 khi b\u1ecb n\u00e9n, \u0111\u01b0\u1eddng k\u00ednh cu\u1ed9n d\u00e2y hi\u1ec7u d\u1ee5ng tr\u1edf n\u00ean nh\u1ecf h\u01a1n v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y ho\u1ea1t \u0111\u1ed9ng c\u0169ng gi\u1ea3m, do \u0111\u00f3 h\u1eb1ng s\u1ed1 l\u00f2 xo tr\u1edf n\u00ean l\u1edbn h\u01a1n.<\/p>\n\n\n\n
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