{"id":33716,"date":"2026-09-24T11:14:42","date_gmt":"2026-09-24T04:14:42","guid":{"rendered":"https:\/\/etest.edu.vn\/?p=33716"},"modified":"2026-09-24T11:14:42","modified_gmt":"2026-09-24T04:14:42","slug":"y-nghia-hang-so-trong-toan-hoc-vi-sao-mot-gia-tri-co-dinh-lai-quan-trong","status":"publish","type":"post","link":"https:\/\/etest.edu.vn\/en\/y-nghia-hang-so-trong-toan-hoc-vi-sao-mot-gia-tri-co-dinh-lai-quan-trong\/","title":{"rendered":"\u00dd ngh\u0129a h\u1eb1ng s\u1ed1 trong to\u00e1n h\u1ecdc: V\u00ec sao m\u1ed9t gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh l\u1ea1i quan tr\u1ecdng?"},"content":{"rendered":"

T\u00ecm hi\u1ec3u \u00fd ngh\u0129a c\u1ee7a h\u1eb1ng s\u1ed1 trong to\u00e1n h\u1ecdc, ph\u00e2n bi\u1ec7t h\u1eb1ng s\u1ed1 v\u00e0 bi\u1ebfn s\u1ed1, c\u00e1c h\u1eb1ng s\u1ed1 n\u1ed5i ti\u1ebfng nh\u01b0 \u03c0, e, \u03c6 c\u00f9ng \u1ee9ng d\u1ee5ng trong <\/span>SAT<\/span><\/a>, khoa h\u1ecdc v\u00e0 \u0111\u1eddi s\u1ed1ng.\u00a0<\/span><\/p>\n

Khi h\u1ecdc to\u00e1n, ch\u00fang ta th\u01b0\u1eddng g\u1eb7p nh\u1eefng k\u00fd hi\u1ec7u nh\u01b0 \u03c0, e, 0, 1 hay c\u00e1c s\u1ed1 xu\u1ea5t hi\u1ec7n c\u1ed1 \u0111\u1ecbnh trong ph\u01b0\u01a1ng tr\u00ecnh. Ch\u00fang \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u1eb1ng s\u1ed1 (constant) \u2013 nh\u1eefng gi\u00e1 tr\u1ecb kh\u00f4ng thay \u0111\u1ed5i trong m\u1ed9t b\u00e0i to\u00e1n ho\u1eb7c trong m\u1ed9t h\u1ec7 th\u1ed1ng to\u00e1n h\u1ecdc.<\/span><\/p>\n

D\u00f9 ch\u1ec9 l\u00e0 m\u1ed9t con s\u1ed1 c\u1ed1 \u0111\u1ecbnh, h\u1eb1ng s\u1ed1 l\u1ea1i \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng trong \u0111\u1ea1i s\u1ed1, h\u00ecnh h\u1ecdc, gi\u1ea3i t\u00edch v\u00e0 c\u1ea3 c\u00e1c k\u1ef3 thi chu\u1ea9n h\u00f3a nh\u01b0 <\/span>Digital SAT<\/span><\/a>. Hi\u1ec3u \u0111\u00fang b\u1ea3n ch\u1ea5t c\u1ee7a h\u1eb1ng s\u1ed1 s\u1ebd gi\u00fap h\u1ecdc sinh \u0111\u1ecdc ph\u01b0\u01a1ng tr\u00ecnh nhanh h\u01a1n, ph\u00e2n bi\u1ec7t r\u00f5 v\u1edbi bi\u1ebfn s\u1ed1 v\u00e0 gi\u1ea3i quy\u1ebft nhi\u1ec1u d\u1ea1ng to\u00e1n m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/span><\/p>\n

\"\"
\u00dd ngh\u0129a h\u1eb1ng s\u1ed1 trong to\u00e1n h\u1ecdc: V\u00ec sao m\u1ed9t gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh l\u1ea1i quan tr\u1ecdng?<\/figcaption><\/figure>\n

H\u1eb1ng s\u1ed1 trong to\u00e1n h\u1ecdc l\u00e0 g\u00ec?<\/b><\/h2>\n

H\u1eb1ng s\u1ed1 l\u00e0 m\u1ed9t gi\u00e1 tr\u1ecb kh\u00f4ng thay \u0111\u1ed5i trong su\u1ed1t qu\u00e1 tr\u00ecnh x\u00e9t m\u1ed9t b\u00e0i to\u00e1n, m\u1ed9t c\u00f4ng th\u1ee9c ho\u1eb7c m\u1ed9t m\u00f4 h\u00ecnh to\u00e1n h\u1ecdc.<\/span><\/p>\n

For example:<\/span><\/p>\n

y=2x+3\u00a0<\/span><\/p>\n

Trong ph\u01b0\u01a1ng tr\u00ecnh tr\u00ean:<\/span><\/p>\n