{"id":33725,"date":"2026-09-24T14:31:34","date_gmt":"2026-09-24T07:31:34","guid":{"rendered":"https:\/\/etest.edu.vn\/?p=33725"},"modified":"2026-09-24T14:34:27","modified_gmt":"2026-09-24T07:34:27","slug":"square-trong-bai-thi-sat-cong-thuc-trong-tam-va-chien-thuat-lam-bai-hieu-qua","status":"publish","type":"post","link":"https:\/\/etest.edu.vn\/en\/square-trong-bai-thi-sat-cong-thuc-trong-tam-va-chien-thuat-lam-bai-hieu-qua\/","title":{"rendered":"Square trong b\u00e0i thi SAT: C\u00f4ng th\u1ee9c tr\u1ecdng t\u00e2m v\u00e0 chi\u1ebfn thu\u1eadt l\u00e0m b\u00e0i hi\u1ec7u qu\u1ea3"},"content":{"rendered":"

\"\"<\/p>\n

Square (h\u00ecnh vu\u00f4ng)<\/b> l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 h\u00ecnh h\u1ecdc quan tr\u1ecdng trong SAT Math, \u0111\u1eb7c bi\u1ec7t khi \u0111\u1ec1 b\u00e0i y\u00eau c\u1ea7u t\u00ednh di\u1ec7n t\u00edch, chu vi, \u0111\u01b0\u1eddng ch\u00e9o ho\u1eb7c k\u1ebft h\u1ee3p h\u00ecnh vu\u00f4ng v\u1edbi c\u00e1c h\u00ecnh h\u1ecdc kh\u00e1c. Kh\u00f4ng ch\u1ec9 c\u1ea7n ghi nh\u1edb c\u00f4ng th\u1ee9c, th\u00ed sinh c\u00f2n ph\u1ea3i nh\u1eadn di\u1ec7n nhanh c\u00e1c t\u00ednh ch\u1ea5t \u0111\u1eb7c tr\u01b0ng c\u1ee7a h\u00ecnh vu\u00f4ng v\u00e0 l\u1ef1a ch\u1ecdn c\u00e1ch gi\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i.\u00a0<\/span><\/p>\n

Trong b\u00e0i vi\u1ebft n\u00e0y, ETEST s\u1ebd t\u1ed5ng h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 ki\u1ebfn th\u1ee9c v\u1ec1 <\/span>Square trong SAT Math<\/b>, t\u1eeb \u0111\u1ecbnh ngh\u0129a, t\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c quan tr\u1ecdng \u0111\u1ebfn c\u00e1c d\u1ea1ng b\u00e0i th\u01b0\u1eddng g\u1eb7p v\u00e0 chi\u1ebfn thu\u1eadt x\u1eed l\u00fd nhanh, gi\u00fap h\u1ecdc sinh x\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc v\u00e0 h\u1ea1n ch\u1ebf m\u1ea5t \u0111i\u1ec3m \u1edf ph\u1ea7n SAT Math.\u00a0<\/span><\/p>\n

V\u00ec sao Square c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong nhi\u1ec1u d\u1ea1ng b\u00e0i SAT Math?<\/b><\/h2>\n

M\u1ed9t h\u00ecnh vu\u00f4ng ch\u1ec9 c\u00f3 v\u00e0i t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n, nh\u01b0ng c\u00e1c t\u00ednh ch\u1ea5t \u0111\u00f3 l\u1ea1i li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u ch\u1ee7 \u0111\u1ec1 kh\u00e1c nhau trong Geometry.<\/span><\/p>\n

Trong SAT, Geometry and Trigonometry kh\u00f4ng ch\u1ec9 ki\u1ec3m tra kh\u1ea3 n\u0103ng \u00e1p d\u1ee5ng m\u1ed9t c\u00f4ng th\u1ee9c \u0111\u01a1n l\u1ebb. College Board m\u00f4 t\u1ea3 nh\u00f3m n\u1ed9i dung n\u00e0y bao g\u1ed3m <\/span>area and volume, lines\/angles\/triangles, right triangles and trigonometry, circles.<\/p>\n

\u0110i\u1ec1u n\u00e0y khi\u1ebfn m\u1ed9t b\u00e0i c\u00f3 h\u00ecnh vu\u00f4ng kh\u00f4ng nh\u1ea5t thi\u1ebft ch\u1ec9 h\u1ecfi: <\/span>\u201cWhat is the area of the square?\u201d<\/span><\/p>\n

Thay v\u00e0o \u0111\u00f3, \u0111\u1ec1 c\u00f3 th\u1ec3 cho \u0111\u01b0\u1eddng ch\u00e9o v\u00e0 y\u00eau c\u1ea7u t\u00ecm di\u1ec7n t\u00edch; cho m\u1ed9t \u0111\u1ec9nh tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 v\u00e0 y\u00eau c\u1ea7u t\u00ecm c\u1ea1nh; ho\u1eb7c \u0111\u1eb7t h\u00ecnh vu\u00f4ng b\u00ean trong m\u1ed9t h\u00ecnh kh\u00e1c \u0111\u1ec3 ng\u01b0\u1eddi l\u00e0m ph\u1ea3i k\u1ebft h\u1ee3p nhi\u1ec1u quan h\u1ec7 h\u00ecnh h\u1ecdc.<\/span><\/p>\n

V\u00ed d\u1ee5, ch\u1ec9 t\u1eeb m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng, c\u00f3 th\u1ec3 suy ra hai tam gi\u00e1c vu\u00f4ng 45\u00b0\u201345\u00b0\u201390\u00b0. \u0110\u00e2y l\u00e0 m\u1ed1i li\u00ean h\u1ec7 quan tr\u1ecdng v\u00ec trong tam gi\u00e1c \u0111\u1eb7c bi\u1ec7t n\u00e0y, c\u1ea1nh huy\u1ec1n b\u1eb1ng c\u1ea1nh g\u00f3c vu\u00f4ng nh\u00e2n v\u1edbi \u221a2.<\/span><\/p>\n

V\u00ec th\u1ebf, c\u00e1ch h\u1ecdc hi\u1ec7u qu\u1ea3 kh\u00f4ng ph\u1ea3i l\u00e0 ghi nh\u1edb c\u00e0ng nhi\u1ec1u c\u00f4ng th\u1ee9c c\u00e0ng t\u1ed1t, m\u00e0 l\u00e0 hi\u1ec3u m\u1ed9t d\u1eef ki\u1ec7n c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nh\u1eefng th\u00f4ng tin n\u00e0o kh\u00e1c.<\/p>\n

Square l\u00e0 g\u00ec? \u0110\u1ecbnh ngh\u0129a v\u00e0 t\u00ednh ch\u1ea5t c\u1ea7n nh\u1edb trong SAT\u00a0<\/b><\/h2>\n

Square<\/b>, hay h\u00ecnh vu\u00f4ng, l\u00e0 m\u1ed9t t\u1ee9 gi\u00e1c c\u00f3 <\/span>4 c\u1ea1nh b\u1eb1ng nhau v\u00e0 4 g\u00f3c vu\u00f4ng<\/b>, trong \u0111\u00f3 m\u1ed7i g\u00f3c c\u00f3 s\u1ed1 \u0111o 90\u00b0.<\/span><\/p>\n

H\u00ecnh vu\u00f4ng \u0111\u1ed3ng th\u1eddi mang nh\u1eefng t\u00ednh ch\u1ea5t c\u1ee7a nhi\u1ec1u lo\u1ea1i t\u1ee9 gi\u00e1c kh\u00e1c:<\/span><\/p>\n

    \n
  • To be <\/span>rectangle (h\u00ecnh ch\u1eef nh\u1eadt)<\/b> v\u00ec c\u00f3 4 g\u00f3c vu\u00f4ng.<\/span><\/li>\n
  • To be <\/span>rhombus (h\u00ecnh thoi)<\/b> v\u00ec c\u00f3 4 c\u1ea1nh b\u1eb1ng nhau.<\/span><\/li>\n
  • To be <\/span>parallelogram (h\u00ecnh b\u00ecnh h\u00e0nh)<\/b> v\u00ec hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i di\u1ec7n song song.<\/span><\/li>\n
  • Hai \u0111\u01b0\u1eddng ch\u00e9o c\u00f3 c\u00f9ng \u0111\u1ed9 d\u00e0i v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m.<\/span><\/li>\n<\/ul>\n
    \"\"
    H\u00ecnh vu\u00f4ng \u0111\u1ed3ng th\u1eddi mang nh\u1eefng t\u00ednh ch\u1ea5t c\u1ee7a nhi\u1ec1u lo\u1ea1i t\u1ee9 gi\u00e1c kh\u00e1c<\/figcaption><\/figure>\n

    Vi\u1ec7c nh\u1eadn di\u1ec7n nh\u1eefng t\u00ednh ch\u1ea5t n\u00e0y r\u1ea5t quan tr\u1ecdng trong SAT Math. \u0110\u1ec1 b\u00e0i kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng tr\u1ef1c ti\u1ebfp y\u00eau c\u1ea7u “find the side of a square”. Thay v\u00e0o \u0111\u00f3, \u0111\u1ec1 c\u00f3 th\u1ec3 cung c\u1ea5p m\u1ed9t s\u1ed1 d\u1eef ki\u1ec7n v\u1ec1 g\u00f3c, c\u1ea1nh ho\u1eb7c \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ec3 h\u1ecdc sinh t\u1ef1 nh\u1eadn ra c\u1ea5u tr\u00fac h\u00ecnh vu\u00f4ng.<\/span><\/p>\n

    T\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh vu\u00f4ng<\/b><\/h3>\n

    H\u00ecnh vu\u00f4ng c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o v\u1edbi nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m quan tr\u1ecdng:<\/span><\/p>\n

      \n
    • Hai \u0111\u01b0\u1eddng ch\u00e9o c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau.<\/span><\/li>\n
    • Hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau.<\/span><\/li>\n
    • Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng.<\/span><\/li>\n
    • M\u1ed7i \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh hai tam gi\u00e1c vu\u00f4ng c\u00e2n b\u1eb1ng nhau.<\/span><\/li>\n
    • \u0110\u01b0\u1eddng ch\u00e9o c\u0169ng l\u00e0 \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a c\u00e1c g\u00f3c trong h\u00ecnh vu\u00f4ng.<\/span><\/li>\n<\/ul>\n

      \u0110\u1eb7c bi\u1ec7t, khi m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o \u0111\u01b0\u1ee3c v\u1ebd v\u00e0o h\u00ecnh vu\u00f4ng, n\u00f3 t\u1ea1o ra <\/span>hai tam gi\u00e1c 45\u00b0\u201345\u00b0\u201390\u00b0<\/b>. \u0110\u00e2y l\u00e0 m\u1ed1i li\u00ean h\u1ec7 r\u1ea5t h\u1eefu \u00edch khi gi\u1ea3i c\u00e1c b\u00e0i SAT c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa square v\u00e0 right triangle.<\/span><\/p>\n

      4 c\u00f4ng th\u1ee9c Square c\u1ea7n n\u1eafm ch\u1eafc khi \u00f4n SAT\u00a0<\/b><\/h2>\n

      \u0110\u1ec3 l\u00e0m t\u1ed1t c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 h\u00ecnh vu\u00f4ng, h\u1ecdc sinh n\u00ean n\u1eafm ch\u1eafc nh\u1eefng c\u00f4ng th\u1ee9c d\u01b0\u1edbi \u0111\u00e2y.<\/span><\/p>\n

      Trong c\u00e1c c\u00f4ng th\u1ee9c, quy \u01b0\u1edbc:<\/span><\/p>\n

        \n
      • (a): \u0111\u1ed9 d\u00e0i c\u1ea1nh h\u00ecnh vu\u00f4ng<\/span><\/li>\n
      • (P): chu vi<\/span><\/li>\n
      • (A): di\u1ec7n t\u00edch<\/span><\/li>\n
      • (d): \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o<\/span><\/li>\n<\/ul>\n

        C\u00f4ng th\u1ee9c chu vi h\u00ecnh vu\u00f4ng (Perimeter)<\/b><\/h3>\n

        V\u00ec h\u00ecnh vu\u00f4ng c\u00f3 4 c\u1ea1nh b\u1eb1ng nhau n\u00ean: <\/span>P = 4a<\/b><\/p>\n

        V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 7 th\u00ec: <\/span>P = 4 \u00d7 7 = 28<\/b><\/p>\n

        Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu \u0111\u1ec1 b\u00e0i cho chu vi v\u00e0 y\u00eau c\u1ea7u t\u00ecm c\u1ea1nh: <\/span>a = P\/4<\/b><\/p>\n

        C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng (Area)<\/b><\/h3>\n

        Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng: <\/span>A = a\u00b2<\/b><\/p>\n

        V\u00ed d\u1ee5, n\u1ebfu c\u1ea1nh h\u00ecnh vu\u00f4ng d\u00e0i 9: <\/span>A = 9\u00b2 = 81<\/b><\/p>\n

        N\u1ebfu \u0111\u1ec1 cho di\u1ec7n t\u00edch v\u00e0 y\u00eau c\u1ea7u t\u00ecm c\u1ea1nh, c\u1ea7n l\u1ea5y c\u0103n b\u1eadc hai: <\/span>a = \u221aA<\/b><\/p>\n

        For example: <\/span>A = 64 \u2192 a = \u221a64 = 8<\/b><\/p>\n

        C\u00f4ng th\u1ee9c \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh vu\u00f4ng (Diagonal)<\/b><\/h3>\n

        \u0110\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c: <\/span>d = a\u221a2<\/b><\/p>\n

        C\u00f4ng th\u1ee9c n\u00e0y xu\u1ea5t ph\u00e1t t\u1eeb \u0111\u1ecbnh l\u00fd Pythagore khi \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh hai tam gi\u00e1c vu\u00f4ng c\u00e2n.<\/span><\/p>\n

        N\u1ebfu \u0111\u1ec1 cho \u0111\u01b0\u1eddng ch\u00e9o v\u00e0 y\u00eau c\u1ea7u t\u00ecm c\u1ea1nh: <\/span>a = d\/\u221a2<\/b><\/p>\n

        C\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i th\u00e0nh: <\/span>a = d\u221a2\/2<\/b><\/p>\n

        C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch theo \u0111\u01b0\u1eddng ch\u00e9o<\/b><\/h3>\n

        M\u1ed9t c\u00f4ng th\u1ee9c r\u1ea5t h\u1eefu \u00edch khi l\u00e0m SAT l\u00e0: <\/span>A = d\u00b2\/2<\/b><\/p>\n

        V\u00ed d\u1ee5, n\u1ebfu \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng b\u1eb1ng 10: <\/span>A = 10\u00b2\/2 = 50<\/b><\/p>\n

        Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, h\u1ecdc sinh <\/span>kh\u00f4ng c\u1ea7n t\u00ecm c\u1ea1nh tr\u01b0\u1edbc. Ch\u1ec9 c\u1ea7n nh\u1eadn di\u1ec7n d\u1eef ki\u1ec7n “diagonal” v\u00e0 \u00e1p d\u1ee5ng tr\u1ef1c ti\u1ebfp c\u00f4ng th\u1ee9c.<\/span><\/p>\n

        B\u1ea3ng t\u1ed5ng h\u1ee3p c\u00f4ng th\u1ee9c Square c\u1ea7n nh\u1edb<\/b><\/h3>\n\n\n\n\n\n\n\n
        \u0110\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm<\/b><\/td>\nRecipe<\/b><\/td>\n<\/tr>\n
        Chu vi<\/span><\/td>\nP = 4a<\/span><\/td>\n<\/tr>\n
        Di\u1ec7n t\u00edch<\/span><\/td>\nA = a\u00b2<\/span><\/td>\n<\/tr>\n
        \u0110\u01b0\u1eddng ch\u00e9o<\/span><\/td>\nd = a\u221a2<\/span><\/td>\n<\/tr>\n
        Di\u1ec7n t\u00edch khi bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o<\/span><\/td>\nA = d\u00b2\/2<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Trong b\u00e0i thi, \u0111i\u1ec1u quan tr\u1ecdng kh\u00f4ng ch\u1ec9 l\u00e0 thu\u1ed9c c\u00f4ng th\u1ee9c m\u00e0 c\u00f2n ph\u1ea3i bi\u1ebft <\/span>c\u00f4ng th\u1ee9c n\u00e0o gi\u00fap \u0111i th\u1eb3ng \u0111\u1ebfn \u0111\u00e1p \u00e1n v\u1edbi \u00edt b\u01b0\u1edbc nh\u1ea5t<\/b>.<\/span><\/p>\n

        M\u1ed9t c\u00e1ch luy\u1ec7n SAT Math hi\u1ec7u qu\u1ea3 l\u00e0 nh\u00ecn d\u1eef ki\u1ec7n \u0111\u1ea7u ti\u00ean v\u00e0 t\u1ef1 h\u1ecfi: <\/span>\u201cT\u1eeb th\u00f4ng tin n\u00e0y, m\u00ecnh c\u00f3 th\u1ec3 suy ra g\u00ec?\u201d<\/b><\/p>\n\n\n\n\n\n\n\n\n\n
        \u0110\u1ec1 b\u00e0i cho<\/b><\/td>\nC\u00f3 th\u1ec3 suy ra<\/b><\/td>\nC\u00f4ng th\u1ee9c n\u00ean ngh\u0129 t\u1edbi<\/b><\/td>\n<\/tr>\n
        C\u1ea1nh<\/span><\/td>\nDi\u1ec7n t\u00edch<\/span><\/p>\n

        Chu vi<\/span><\/p>\n

        \u0110\u01b0\u1eddng ch\u00e9o<\/span><\/td>\n

        		A = a\u00b2<\/span><\/p>\n

        P = 4a<\/span><\/p>\n

        d = a\u221a2<\/span><\/td>\n<\/tr>\n

        Chu vi<\/span><\/td>\nc\u1ea1nh \u2192 di\u1ec7n t\u00edch, \u0111\u01b0\u1eddng ch\u00e9o<\/span><\/td>\na = P\/4<\/span><\/td>\n<\/tr>\n
        Di\u1ec7n t\u00edch<\/span><\/td>\nc\u1ea1nh \u2192 chu vi, \u0111\u01b0\u1eddng ch\u00e9o<\/span><\/td>\na = \u221aA\u00a0<\/span><\/td>\n<\/tr>\n
        \u0110\u01b0\u1eddng ch\u00e9o<\/span><\/td>\nDi\u1ec7n t\u00edch, c\u1ea1nh<\/span><\/td>\nA = d\u00b2\/2<\/span><\/p>\n

        a=d\/\u221a2<\/span><\/td>\n<\/tr>\n

        Trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh<\/span><\/td>\n\u0110\u1ed9 d\u00e0i c\u1ea1nh<\/span><\/td>\nDistance + midpoint relationship<\/span><\/td>\n<\/tr>\n
        Hai \u0111\u1ec9nh tr\u00ean coordinate plane<\/span><\/td>\n\u0110\u1ed9 d\u00e0i c\u1ea1nh\/\u0111\u01b0\u1eddng ch\u00e9o<\/span><\/td>\nDistance formula<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \u0110i\u1ec3m quan tr\u1ecdng l\u00e0 <\/span>kh\u00f4ng ph\u1ea3i c\u00e2u h\u1ecfi n\u00e0o c\u0169ng y\u00eau c\u1ea7u s\u1eed d\u1ee5ng t\u1ea5t c\u1ea3 d\u1eef ki\u1ec7n<\/b>.<\/span><\/p>\n

        N\u1ebfu \u0111\u1ec1 cho \u0111\u01b0\u1eddng ch\u00e9o v\u00e0 h\u1ecfi di\u1ec7n t\u00edch, vi\u1ec7c t\u00ecm c\u1ea1nh tr\u01b0\u1edbc c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t b\u01b0\u1edbc th\u1eeba.<\/span><\/p>\n

        N\u1ebfu \u0111\u1ec1 cho chu vi v\u00e0 h\u1ecfi di\u1ec7n t\u00edch, b\u1ea1n kh\u00f4ng c\u1ea7n d\u1ef1ng h\u00ecnh hay s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng ch\u00e9o.<\/span><\/p>\n

        SAT th\u01b0\u1edfng cho kh\u1ea3 n\u0103ng nh\u1eadn di\u1ec7n \u0111\u01b0\u1eddng gi\u1ea3i ng\u1eafn, kh\u00f4ng ph\u1ea3i s\u1ed1 l\u01b0\u1ee3ng c\u00f4ng th\u1ee9c b\u1ea1n c\u00f3 th\u1ec3 vi\u1ebft ra.<\/b><\/p>\n

        Chi\u1ebfn thu\u1eadt l\u00e0m b\u00e0i Square trong SAT<\/b><\/h2>\n

        B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i<\/b><\/h3>\n

        Tr\u01b0\u1edbc ti\u00ean, h\u00e3y x\u00e1c \u0111\u1ecbnh \u0111\u1ec1 \u0111ang cung c\u1ea5p:<\/span><\/p>\n