1. T\u00edch ph\u00e2n<\/b><\/p>\n

a) \u0110\u1ecbnh ngh\u0129a: Cho h\u00e0m s\u1ed1 f(x) li\u00ean t\u1ee5c tr\u00ean \u0111o\u1ea1n [a; b] . Gi\u1ea3 s\u1eed F(x) l\u00e0 m\u1ed9t nguy\u00ean h\u00e0m c\u1ee7a f(x) tr\u00ean \u0111o\u1ea1n [a; b] . Hi\u1ec7u s\u1ed1 F(b) \u2013 F(a) \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u00edch ph\u00e2n t\u1eeb a \u0111\u1ebfn b ( hay t\u00edch ph\u00e2n x\u00e1c \u0111\u1ecbnh tr\u00ean \u0111o\u1ea1n [a; b] c\u1ee7a h\u00e0m f(x), k\u00ed hi\u1ec7u l\u00e0<\/p>\n

<\/p>\n

V\u1eady ta c\u00f3<\/p>\n

<\/p>\n

Ch\u00fa \u00fd:<\/p>\n

<\/p>\n

+ T\u00edch ph\u00e2n kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o ch\u1eef l\u00e0m bi\u1ebfn s\u1ed1 trong d\u1ea5u t\u00edch ph\u00e2n, t\u1ee9c l\u00e0<\/p>\n

<\/p>\n

b) T\u00ednh ch\u1ea5t<\/p>\n

<\/p>\n

<\/p>\n

(a < c_{1<\/sub>\u00a0< c2<\/sub>\u00a0< … < cn<\/sub>\u00a0< b)<\/p>\n}

2. Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh t\u00edch ph\u00e2n<\/b><\/p>\n

a) Ph\u01b0\u01a1ng ph\u00e1p bi\u1ebfn \u0111\u1ed5i bi\u1ebfn s\u1ed1<\/p>\n

\u0110\u1ecbnh l\u00ed 1. Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 x = \u03c6(t) c\u00f3 \u0111\u1ea1o h\u00e0m li\u00ean t\u1ee5c tr\u00ean \u0111o\u1ea1n [a; b] sao cho \u03c6(\u03b1) = a, \u03c6(\u03b2) = b v\u00e0 a \u2264 \u03c6(t) \u2264 b, \u2200t \u2208 [a; b] . Khi \u0111\u00f3<\/p>\n

<\/p>\n

\u0110\u1ecbnh l\u00ed 2. Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 u = u(x) c\u00f3 \u0111\u1ea1o h\u00e0m li\u00ean t\u1ee5c tr\u00ean \u0111o\u1ea1n [a; b] sao cho \u03b1 \u2264 u(x) \u2264 \u03b2, \u2200x \u2208 [a; b] .<\/p>\n

N\u1ebfu f(x) = g(u(x))u'(x), \u2200x \u2208 [a; b] trong \u0111\u00f3 g(u) li\u00ean t\u1ee5c tr\u00ean \u0111o\u1ea1n [\u03b1 \u03b2] th\u00ec<\/p>\n

<\/p>\n

b) Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh t\u00edch ph\u00e2n t\u1eebng ph\u1ea7n<\/p>\n

\u0110\u1ecbnh l\u00ed. N\u1ebfu u = u(x), v = v(x) l\u00e0 hai h\u00e0m s\u1ed1 c\u00f3 \u0111\u1ea1o h\u00e0m li\u00ean t\u1ee5c tr\u00ean \u0111o\u1ea1n [a; b] , th\u00ec<\/p>\n

<\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

1. T\u00edch ph\u00e2n a) \u0110\u1ecbnh ngh\u0129a: Cho h\u00e0m s\u1ed1 f(x) li\u00ean t\u1ee5c tr\u00ean \u0111o\u1ea1n [a; b] . Gi\u1ea3 s\u1eed F(x) l\u00e0 m\u1ed9t nguy\u00ean h\u00e0m c\u1ee7a f(x) tr\u00ean \u0111o\u1ea1n [a; b] . Hi\u1ec7u s\u1ed1 F(b) \u2013 F(a) \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u00edch ph\u00e2n t\u1eeb a \u0111\u1ebfn b ( hay t\u00edch ph\u00e2n x\u00e1c \u0111\u1ecbnh tr\u00ean \u0111o\u1ea1n [a; b] […]<\/p>\n","protected":false},"author":3,"featured_media":27033,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[157],"tags":[1447,1446],"yoast_head":"\n