= M + M + M + M M + =.,. f = < ρ, > ρ ρ. ρ f. = ρ = = ± = log 4 = = = ± f = k k ρ. k

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1 7 b f n f} d = b f n f d,. 5,. [ ] ɛ >, n ɛ + + n < ɛ. m. n m log + < n m. n lim sin kπ sin kπ } k π sin = n n n. k= 4 f, y = r + s, y = rs f rs = f + r + sf y + rsf yy + f y. f = f =, f = sin. 5 f f =. 6 lim sin =. 4.6, 4.7, 4.8,, 5., 5., 5., 5.4 d f k = d n } lim f k = d lim d d d S n. k= k= d,, d f n } d k = lim d f k., k= k= n } d d, = lim f k = lim d d S n.,, k=,. lim f n = f =, I d d f d n lim d f n = g 4. I,, g = f d d,, lim d f n = lim d f n. 5 f n = n d n. d f n = n. f n,, 5. 4,. n f k f = k + f n+ c k! n +! n+ c k= f k, < r,, f = k k! k= f k., f. = f = k k!,. f = tn, f = f = + f,, = = , =, =, 5 = 5, 7 = 7 5,., tn = =, <.,, , lim n n =.,,,,,. M. k=

2 = M + M + M + M M + =.,. f = < ρ, > ρ ρ. ρ f. = ρ = = ± = log 4 = = = ± f = k k ρ. k=. ρ +. k ρ k, k= 8 lim f ρ < ρ, ρ.,., < ρ < ρ ρ, ρ,.., ρ = lim n n+ ρ = lim n n. f, y = + y, df dy f = +, d d =. f = g, y = + y f, g.,., f, y, y + y, f, y, f, =, f y, =. f = f +, y + y f, y A + B y +, y, df = Ad + Bdy, f, y.,, A = f, B = f., f, f, f y C.,., f, y = y, f, =, f y, =,. chin rule. f, y = r + s, y = rs,. f r = f r + f r = f + f s. f s = f s + f s = f + f r. f, y, y, f y, y. f, y =, y, f y, y, y =. i f y, y >. f y, y f y, y >, f, y y. h >, f, y h < f, y + h >, f, y, y h f, y <, y + h f, y >.,. ii f y, y <.. f, y, y =, b. f, y = f, b + f, b + f y, by b} + f, b + f y, b y b + f yy, by b } +! f, b +f y, b y b+f yy, b y b +f yyy, by b }+., y =,. + y = + y y + y + y + = + y +,. yy + yy y +.!.. 5.5, 5.6, 5.7, 5.8

3 9 5,. yz,, y =,,,. z = + 4y + 5y. z = + 4y + y. z = + 4y 5y. 5.7, 5.8, F, G : R R C F, F y, F z, G, G y, G z. F, y, z = G, y, z = C, y, z, Fy F z det, = C, y, z =, f, g. G y G z f, g C. C : + y + z = 8 + y + z =,, + y y + z z = + y + z =., C, y, z =,,, + y + 4z = + y + z =., dy d = y =, dz d = z = f, f : R R C. A, =,, f f det, A y, y = b, b h, h : R R f f C f f, g : R R C f y. A, y =, b, A, f g., C F, y, F f, g.. z = c + + hy + by. i b h > >. z = c + + h y b h + y, + h y y,, y =, z = c.,, y =,. ii b h > <. b h, < <,, y =, z = c.,, y =,. iii b h <. y =, z = c +. + h b h y =, z = c + y.. >,. <,., b h <,.,, c sddle point., y =, z = c. g g y

4 4 f, y α, β f, y = fα, β + f α, β α + f y α, βy β + f α, β α + f y α, β αy β + f yy α, βy β } + f α, β =,, f y α, β = f, y = fα, β + f α, β α + f y α, β αy β + f yy α, βy β } +., f = f f, = f f y, = f f, = f f y, = f f y, = f yy.,, f, y f α, β = f α, βf yy α, β f i yα, β >, y = α, β f y α, β = f α, β > fα, β, f α, β = f α, βf yy α, β f ii yα, β >, y = α, β f y α, β = f α, β < fα, β. f α, β = iii f α, βf yy α, β f f y α, β = yα, β <, y = α, β, fα, β. iv f α, βf yy α, β f yα, β =,,,.. 4 z = 4y y 4. 5 z = + y 4y + y. f, y g, y =, h, y = f, y λg, y, h, h y, h λ =,,. g, y = = t, y = yt, z = ft, yt t, dz dt = f d dt + f dy., dt f d f d d f dt =., dy f dt., dt g, y = dy dy dt dt dt f g, f, g, y = g., f f = λ g g f f λ g g h = g, y = g, y =. λ = h h = f, y, z g, y, z =, h, y, z = f, y, z λg, y, z, h, h y, h z, h λ =,,,.. f, y, z g, y, z = g, y, z =, h, y, z = f, y, z λg, y, z µg, y, z, h, h y, h z, h λ, h µ =,,,,.. 6 z = + y + y C : + y = M, m. 7 z = y + yz + z S : + y + z = M, m. 6.,.

5 4 7 5,. 96 i f, y = + y y. v y + yz + z = 6 + y + z = yz,. 6., b I. y = f I. I n, = < < < n < n = b. t k k k., ft k S k n S k = ft k k k. S, S k S n = S k. k k. n, lim S n., I t k S, S f I, S = b k= f d. I : b I J y. J : c y d z = f, y, y y K. I m, = < < < m < m = b., J n, c = y < y < < y n < k k y n = d. y s k, t l., l y y l fs k, t l V k,l V k,l = fs k, t l k k y l y l m n. K V, V k,l V m,n = fs k, t l k k y l y l k= l=. k k y l l. mn, lim V m,n, s k, t l V, V f, y, V = f, y ddy.,,.. b, p y q. q b f, y ddy f, y d dy p b q :, y. y + y ddy = y + y d dy = [ ] 8 = y + y =. p f, y dy d. [ y + y ] dy =, b.,,, b,, 8 y + y dy

6 4 :, y, + y b. b y, y b b. b b y b b f, y ddy f, y d dy f, y dy d. :, y, + y. y [ ] + y ddy = + y y d dy = + y dy } ] y = + y y4 y dy = [ + y y4 = = 6. = π :, y, + y π.. π π } y π cos + y ddy = cos + y d dy = [sin + y] π y dy sin π sin y dy = [y + cos y] π = π. y. :, y.,., y,. : y, y I = y ddy = y d dy., + A d = + A + A log + } + A + C, [ y y log + ] y = y y log + } y y + y log y., π 4, π + 9, 9. π,. y,, y. :, y I = y dy d., z = y z = y, z y +z =, z,., y, π 4., π I = 4 d = π d = π [ ] = π 4 4. : b, g y h. h f, y ddy f, y dy d. g : y.., ] + y ddy = + y dy d = [ y + y d = + } [ d = ] 5 = = 4. y : gy hy, y b. hy f, y ddy f, y d dy. gy 7., 7., 7., 7.4, 7.5, 7.6, 7.7 y

7 4 y + yz + z = 6 + y + z = C. C z + y + y y + 6 = 4 + 4y 4 + y 4 = C y C. C 4 + y 4 = 4 4, 4 π. C,. 4 ft f t C : =, v = y gt g C t f t., = g, C t., f t f t det g t g C, C. t, v // ,. 65 iii y + y. I = y y ddy = 4 = X 5.. y = Y 7., 7., 7. C :, y = ft, gt, f t, g t =, 5. F C : F, y =,, F =, iii y y =,. = t, y = t, t., y, y =.,. 7 t, t t. + y =,. y = t,, y =, y, + y =.,.,. 9 C :, y = ft, gt t b ft, gt. t b L. C, C. C. ft, gt C, L =, h C, y = h b L = 46 b f t} + g t} dt. b + h } d. y, P f. b P V f f b., f b.

8 44 C, y = u, v, yu, v E,,. f, y ddy = fu, v, yu, v det u v dudv E y u y v = fu, v, yu, v u y v v y u dudv. E r, θ E,, y = r cos θ, r sin θ, f, y ddy = fr cos θ, r sin θ rdrdθ. E r θ cos θ r sin θ det = det = r. y r y θ sin θ r cos θ yz K, I = f, y, z ddydz w = f, y, z yz K, K 4. K b, g y g, h, y z h, y, I b g } h,y f, y, z dz dy dz. g h,y K : + y + z,, y, z, I = yz ddydz. K :, y, z y, y } I = yz dz dy dz = u, v, w E,, y, z, f, y, z ddydz = fu, v, w, yu, v, w, zu, v, wdet Jdudvdw E u v w., J = y u y v y w. z u z v z w r, θ, z E,, y, z = r cos θ, r sin θ, z, f, y, z ddydz = fr cos θ, r sin θ, z rdrdθdz. E r, θ, ϕ E,, y, z = r sin θ cos ϕ, r sin θ sin ϕ, r cos θ, f, y, z ddydz = fr cos θ, r sin θ, z r sin θdrdθdϕ. E, r sin θ r θ ϕ sin θ cos ϕ r cos θ cos ϕ r sin θ sin ϕ det J = det y r y θ y ϕ = det sin θ sin ϕ r cos θ sin ϕ r sin θ cos ϕ. z r z θ z ϕ cos θ r sin θ R : + y b + z c, I = ddydz. R = X, y = by, z = cz, R : X + Y + Z. I = X bc dxdy dz = bc X dxdy dz R R π π } = bc r sin θ cos ϕ r sin θ dr dθ dϕ = bc 5 4 π = 4π 5 bc. 7.4, 7.5, 7.6 K

9 45 4 5,. 74 I = e t dt, J = e y ddy., y. J = I. J J = π, I = π , 7.5, 7.6 K n. K K K K n. K n, f, y ddy, f, y ddy. K n :, y. I = sin + y ddy. i K n : n, y n. I n = sin + y ddy, K n n n } n n I n = sin + y d dy = sin cos y + cos sin y } d dy n n n n = sin d cos y dy + cos d sin y dy. sin t dt, cos t dt π π π, lim I n = + = π 4. ii K n : + y n., L n : r n, θ π. π J n = sin + y ddy = sin r n } π [ rdrdθ = sin r rdr dθ = ] n K n L n cos r dθ π = cos n [ dθ = cos n ] π θ = cos n π 4. J n lim J n. iii I. 77 s > Γs = = t, t > Γs = Γ = e d = [ e ] =. s s e d. t s e t dt. lim = s > Γs + = sγs. e 4 n, Γn = n!., Γ., Γ =!. 5 Γ = π., Γ = e e d = d. = t, d dt = t d = tdt., t = e t t tdt = e t dt =, π, Γ + n n = e.,., e t dt.,. = π.,! = π. n n n 6 lim n > n e. Γs = lim n s n n d.

10 46 n s n! 7 6 = nt Γs = lim ss + s + s + n. 8 Γs = eγs s + se s + s 9 lim s lim e s + s e s + s e s 4., γ = Γs + =. n s = n, πs ss e s n! πn nn e n =., n! πn n n e n.. 8 n n, 4, π 4 4 = π 4 Γ + Γ 4 = π! 4 = π p >, q > Bp, q = = y, Bp, q = + y = sin θ, Bp, q = π y p dy., p+q =, + y p+q sin p θ cos q θ dθ. π n n n. Γ + p q d. y p + y dy = π sin pπ., Bp, q + = q p Bp +, q. Bp + q, = p + q p!q!, p, q, Bp, q =. Γ, p + q! Bp, q = ΓpΓq., p, q., Γp + q ΓpΓq = 4 p e d y q e y dy = 4 Γp + qbp, q. b 4 t p b t q dt t = b, Bp, qb p+q. p =, q =, 5 Γ b b t b t dt = p y q e y ddy. t b t dt = B, b + = ΓΓ b Γ +!! b = +! 6 b. = π. 5. Bp, q = ΓpΓq Γp + q p =, q =. 8 S :, y, z = fu, v, gu, v, hu, v u, v, u u, f u u, v u, g u u, v u, h u u, v u. v v, f v u, v v, g v u, v v, h v u, v v. A,, A = f u u, v, g u u, v, h u u, v u f v u, v, g v u, v, h v u, v v = gu u, v h u u, v hu u, v f u u, v fu u, v g u u, v det, det, det. g v u, v h v u, v h v u, v f v u, v f v u, v g v u, v, S A, A = gu h v g v h u + h u f v h v f u + f u g v f v g u dudv. z = f, y, y, A = f + f y + ddy. 7.6, 7.7

11 47 5,. 98 ii < < b., b b + cos θ cos ϕ = b + cos θ sin ϕ θ, ϕ., sin θ : θ π, ϕ π. θ, ϕ θ, ϕ. cos θ cos ϕ θ ϕ b + cos θ cos θ sin ϕ. sin θ θ ϕ dθdϕ,, 4π b. 4 + y b + z =. 5 f, y = + y b,, y., : b + y b +., + f, y} + f y, y} =. + y b 6. + f, y} + f y, y} ddy,, 4π b , 7.7 C, t b,, y = t, yt, b f, yd + g, ydy ft, yt d + gt, ytdy dt. C dt dt C, t b,, y, z = t, yt, zt, f, y, zd + g, y, zdy + h, y, zdz C b ft, yt, zt d + gt, yt, ztdy + ht, yt, ztdz dt. dt dt dt,. C t b,, y = t, yt. C. f, yd + g, ydy = f C + g ddy. y C., C C,. y C d + dy = dy yd = + C y ddy = + } ddy, ddy = =.

12 48 S :, y, z = s, t, ys, t, zs, t s, t I = f, y, zdydz + g, y, zdzd + h, y, zddy,, S f, y, z s t f, y, z y s z t z s y t I = g, y, z y s y t dsdt = g, y, z z s t s z t dsdt h, y, z z s z t h, y, z s y t y s t = f, y, zy s z t z s y t + g, y, zz s t s z t + h, y, z s y t y s t } dsdt. K S. p, y, zdydz + q, y, zdydz + r, y, zdzd = S yz S C. p, y, zd + q, y, zdy + r, y, zdz C r = S q p dydz + z z r q dydz + p dzd. K p + q + r ddydz. z C, C. 8 y C + y d + dy ddy =, C + y r, π.. K,. K : + y + z, z.,, y, z = r sin θ cos ϕ, r sin θ sin ϕ, r cos θ r, θ π, ϕ π. S K. S H : +y +z =, z y : +y, z =., H,, y, z = s, t, s t s + t, y, z = sin θ cos ϕ, sin θ sin ϕ, cos θ θ π, ϕ π., y, z = s, t, s + t, y, z = r cos θ, r sin θ, r, θ π.. 9 dydz + ydzd + zddy. S ydydz + zdzd + ddy. S S, z z = z. S : z = y, z.,, y, z = s, t, s t s + t, y, z = r cos θ, r sin θ, r r, θ < π. C S, C : + y =, z =.,, y, z = r cos θ, r sin θ, zd + dy + ydz C d + ydy + zdz. C θ < π..

1 2 1 No p. 111 p , 4, 2, f (x, y) = x2 y x 4 + y. 2 (1) y = mx (x, y) (0, 0) f (x, y). m. (2) y = ax 2 (x, y) (0, 0) f (x,

1 2 1 No p. 111 p , 4, 2, f (x, y) = x2 y x 4 + y. 2 (1) y = mx (x, y) (0, 0) f (x, y). m. (2) y = ax 2 (x, y) (0, 0) f (x, No... p. p. 3, 4,, 5.... f (, y) y 4 + y. () y m (, y) (, ) f (, y). m. () y a (, y) (, ) f (, y). a. (3) lim f (, y). (,y) (,)... (, y) (, ). () f (, y) a + by, a, b. + y () f (, y) 4 + y + y 3 + y..3.

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M3 x y f(x, y) (= x) (= y) x + y f(x, y) = x + y + *. f(x, y) π y f(x, y) x f(x + x, y) f(x, y) lim x x () f(x,y) x 3 - M3............................................................................................ 3.3................................................... 3 6........................................... 6..........................................

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