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tài liệu toán cao cấpTRANSCRIPT
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B CNG THNGTRNG I HC CNG NGHIP THC PHM
TP. HCM
L HU K SN
Bi tpTon cao cp A2 - C2
MSSV: . . . . . . . . . . . . . . . . . . . . . . . . . .H tn: . . . . . . . . . . . . . . . . . . . . . . . . . .
TP. HCM Ngy 15 thng 2 nm 2012
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Mc lc
1 MA TRN V NH THC 31.1 Ma trn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2 nh thc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.3 Ma trn nghch o . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.4 Hng ca ma trn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 H PHNG TRNH TUYN TNH 8
3 KHNG GIAN VECTOR 93.1 Khng gian vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.2 Khng gian Euclide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 NH X TUYN TNH 11
4.1 nh x tuyn tnh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114.2 Gi tr ring - vector ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 DNG TON PHNG 14
Ti liu tham kho 15
2
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Chng 1
MA TRN V NH THC
1.1 Ma trn
1. Cho A =
1 21 33 4
;B = 0 13 22 3
;C =2 31 2
4 1
.Tnh (A+B) + C;A+ (B + C); 3A 2B; (3A)t; (3A 2B)t.
2. Cho ma trn A =
1 2 10 1 23 1 1
;B = 2 3 11 1 0
1 2 1
;C =2 3 01 2 4
4 1 0
.Tnh A.B.C v A.C +B.C.
3. Tnh A =
a b cc b a1 1 1
1 a c1 b b1 c a
.4. Cho ma trn
(1 02 1
), hy tm ma trn A2012.
5. Cho ma trn
(1 05 1
), hy tm ma trn A2012.
6. Cho ma trn A =
(cos sinsin cos
), hy tm ma trn A2012.
7. Cho ma trn A =
(0 11 0
), hy tm ma trn A2012.
8. Cho ma trn A =
(0 01 0
). Tnh ma trn (I A)2012.
9. Cho ma trn J =
0 0 11 0 00 1 0
. Tnh ma trn J201210. Cho ma trn A =
(0 01 0
). Hy tnh tng sau
2012n=0
2nAn = In + 2A+ 4A2 + 8A3 + 16A4 + + 22011A2011 + 22012A2012
3
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11. Cho ma trn A =
(0 01 0
). Hy tnh tng sau
2012n=0
An = In + A+ A2 + A3 + A4 + + A2011 + A2012
12. Cho ma trn A =
(0 10 0
). Hy tnh tng sau
2012n=0
2nAn = In + 2A+ 4A2 + 8A3 + 16A4 + + 22011A2011 + 22012A2012
13. Cho ma trn A =
(0 10 0
). Hy tnh tng sau
2012n=0
An = In + A+ A2 + A3 + A4 + + A2011 + A2012
14. Cho ma trn A =
0 1 10 0 10 0 0
. Hy tnh tng sau2012n=0
(2)nAn = In 2A+ 4A2 8A3 + 16A4 + + (2)2011A2011 + (2)2012A2012
15. Cho ma trn A =
(a bc d
), hy tnh A2 (a+ d)A+ (ad bc)I2.
16. Tm f(A) nu
a. f(x) = x2 5x+ 3 vi A =(
2 13 3
);
b. f(x) = x2 x 1 vi A =2 1 13 1 2
1 1 0.
.17. Cho A l ma trn vung cp 1000 m phn t dng i l i. Tm phn t dng 1 ct
3 ca ma trn A2.
18. Cho A l ma trn vung cp 1000 m phn t dng i l (1)ii. Tm phn t dng2 ct 3 ca ma trn A2.
19. Cho A l ma trn vung cp 1000 m phn t dng i ct j l (1)i+j. Tm phn t dng 1 ct 2 ca ma trn A2.
20. Cho A l ma trn vung cp 1000 m phn t dng i l 2i1. Tm phn t dng 2ct 4 ca ma trn A2.
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21. Hy tm s n nguyn dng nh nht ma trn An = 0 (ma trn-khng), vi
a. A =
0 1 00 0 10 0 0
b. A =0 1 10 0 1
0 0 0
c. A =0 0 10 0 0
0 0 0
d. A =
0 0 1 10 0 0 10 0 0 00 0 0 0
e. A = 0 0 01 0 01 1 0
1.2 nh thc
1. Bit cc s 204, 527, 255 chia ht cho 17. Khng tnh nh thc, chng minh rng:2 0 45 2 72 5 5
chia ht cho 17.2. Tnh cc nh thc sau
1 =
5 3 21 2 47 3 6
; 2 =
1 1 11 0 11 1 0
; 3 =a a aa a xa a x
; 4 =1 1 11 2 31 3 6
5 =
0 1 11 0 11 1 0
; 6 =a b cb c ac a b
; 7 =0 a 0b c d0 c 0
; 8 =a x xx b xx x c
;9 =
a+ x x xx b+ x xx x c+ x
; 10 =sin a cos a 1sin b cos b 1sin c cos c 1
; 11 =
1 1 1x y zx2 y2 z2
; 12 =x y x+ yx x+ y x
x+ y y y
3. Gii cc phng trnh v bt phng trnh
a.
x x+ 1 x+ 2
x+ 3 x+ 4 x+ 5x+ 6 x+ 7 x+ 8
= 0;b.
2 x+ 2 11 1 25 3 x
0;4. Chng minh rng
a.
a1 + b1x a1x+ b1 c1a2 + b2x a2x+ b2 c2a3 + b3x a3x+ b3 c3
= (1 x2)a1 +b1 c1a2 b2 c2a3 b3 c3
;b.
1 a a3
1 b b3
1 c c3
= (a+ b+ c)1 a a2
1 b b2
1 c c2
;5. Hy tnh cc nh thc sau
1 =
4 5 2 62 2 1 36 3 3 94 1 5 6
; 2 =3 9 4 21 2 0 32 3 0 12 1 2 1
; 3 =1 1 1 11 1 2 21 1 1 31 1 1 1
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6. Hy tnh nh thc ca ma trn
2 b 2 2 bb 2 b2 + 4 4b2 b 4b b2 + 4
p s : nh thc ma trn bng 0.
7. Tnh nh thc cp n: Dn =
5 3 0 0 0 02 5 3 0 0 00 2 5 3 0 0 0 0 0 0 2 5
8. Tnh nh thc Vandermond: Dn =
1 x1 x
21 xn11
1 x2 x22 xn12
1 xn x
2n xn1n
1.3 Ma trn nghch o
1. Tm s thc m ma trn A =
(m 10 m 1
)(m 1 0
1 m 1)(
m 1 01 m 2
)kh
nghch.
2. Cho ma trn A =
0 1 0 00 m 1 00 m m2 14 0 0 0
. Hy tm phn t dng 1 ct 4 ca A1.p s :
14.
3. Cho ma trn A =
(1 23 4
)v B =
(1 2 33 2 1
). Tm ma trn X tha AX = B.
4. Cho ma trn A =
(1 23 4
)v B =
(7 7 11 7 7
). Tm ma trn X tha AX = B.
5. Tm ma trn X tha mn phng trnh
(2 13 2
)X
(3 25 3
)=
(2 43 1
)
6. Tm ma trn X tha mn phng trnh
1 2 32 6 51 3 2
X =1 02 1
0 1
7. Tm ma trn X tha mn phng trnh X
1 2 02 2 31 1 1
= (2 1 00 1 1
)
8. Tm ma trnX tha mn phng trnh
3 0 18 1 15 3 2
1 1 11 0 11 1 2
X =3 0 18 1 1
5 3 2
9. Tm ma trnX tha mn phng trnhX
1 2 13 2 02 3 1
2 3 50 1 62 0 6
=2 3 50 1 6
2 0 6
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10. Tm ma trn X tha mn phng trnh
2
8 1 51 6 22 4 0
X 17 3 92 11 35 7 2
X =1 20 1
2 1
11. Tm ma trn X tha mn phng trnh
2X
1 0 12 2 12 3 3
+X1 2 54 5 3
5 4 2
X = (1 2 02 3 1
)
12. Cho A =
0 1 1 11 0 1 11 1 0 1 1 1 1 0
. Tm A1.
1.4 Hng ca ma trn
1. Tm hng ca cc ma trn sau
1)
2 1 3 2 44 2 5 1 72 1 1 8 2
; 2)
1 3 5 12 1 3 45 1 1 77 7 9 1
; 3)
4 3 5 2 38 6 7 4 24 3 8 2 74 3 1 2 58 6 1 4 6
4)
1 3 1 67 1 3 1017 1 7 223 4 2 10
; 5)
0 1 10 32 0 4 5216 4 52 98 1 6 7
; 6)
2 2 1 5 11 0 4 2 12 1 5 0 11 2 2 6 13 1 8 1 11 2 3 7 2
2. Tm m hng ca ma trn A =
1 2 3 45 8 11 m+ 152 3 4 53 5 7 m+ 10
bng 2.p s : m = 1.
3. Bin lun hng ca cc ma trn sau theo tham s m
A =
3 m 1 21 4 7 21 10 17 44 1 3 3
; B =1 2 1 1 1m 1 1 1 11 m 0 1 11 2 2 1 1
; C =
3 1 1 4m 4 10 11 7 17 32 2 4 3
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Chng 2
H PHNG TRNH TUYN TNH
1. Cho h phng trnh Ax = B 5 1 1 2 126 7 4 2 1
31 8 5 4 2
x =abc
. Tm iu kinca a, b, c h c nghim.p s : a b+ c = 0.
2. nh m h phng trnh sau v nghim
x+my + z = mx+ 2y + 2z = 12x+ (m+ 2)y + (m2 + 2)z = m2 +m
p s : m = 2.
3. Tm m 2 h sau c nghim chung{x y + z + 2t = 2m2x 3y 2z 5t = 2 v
{2x+ 3y + z 5t = 3m5x 9y 11z 26t = 1
p s : m = 32.
4. Gii cc h phng trnh sau
1)
2x y z = 43x+ 4y 2z = 113x 2y + 4z = 11
; 2)
x+ y + 2z = 12x y + 2z = 44x+ y + 4z = 2
; 3)
x 3y + 4z + t = 12x 5y + z 5t = 25x 13y + 6z = 5
4)
x+ 2y + 4z = 315x+ y + 2z = 293x y + z = 10
; 5)
x+ y + 2z + 3t = 13x y z 2t = 42x+ 3y z t = 6x+ 2y + 3z t = 4
; 6)
x+ 2y + 3z + 4t = 52x+ y + 2z + 3t = 13x+ 2y + z + 2t = 14x+ 3y + 2z + t = 5
7)
y 3z + 4t = 5x 2z + 3t = 43x+ 2y 5t = 124x+ 3y 5z = 5
; 8)
x 2y + z + t = 1x 2y + z t = 1x 2y + z + 5t = 5
; 9)
x+ y 3z = 12x+ y 2z = 1x+ y + z = 3x+ 2y 3z = 1
5. Tm m h
x+ 3y + 4z t = 22x+ 7y + 4z + t = m+ 11x+ 5y 4z + 5t = m+ 9
c nghim v gii vi m .
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Chng 3
KHNG GIAN VECTOR
3.1 Khng gian vector
1. Trong R3 , trong cc h sau, h no l h ph thuc tuyn tnh
A A = {u1 = (5, 4, 3), u2 = (3, 3, 2), u3 = (8, 1, 3)},B B = {u1 = (2,1, 3), u2 = (3,1, 5), u3 = (1,4, 3)}C C = {u1 = (1, 2, 3), u2 = (4, 5, 6), u3 = (7, 8, 9)}D D = {u1 = (0, 1, 2), u2 = (1, 2, 7), u3 = (0, 4, 4)}.
2. Cho P2 l tp hp cc a thc bc b hn hoc bng 2 vi h s thc. Chng minh rng
a. H A = {p1(x) = 1 + 2x + 3x2, p2(x) = 2 + 3x + 4x2, p3(x) = 3 + 5x + 7x2} l phthuc tuyn tnh.
b. H B = {q1(x) = 1, q2(x) = 1 + x, q3(x) = 1 + x+ x2} l c lp tuyn tnh.c. H {p(x), p(x), p(x)}, trong p(x), p(x) l o hm cp 1 v cp 2 ca p(x) =
ax2 + bx+ c; a, b, c R l c lp tuyn tnh.3. Chng minh rng tp hp F = {y = (y1, y2, y3, y4)|y2 + y3 + y4 = 0} l mt khng gian
vector con ca R4.
4. Tm iu kin vector (x, y, z) khng phi l mt t hp tuyn tnh ca hF = {u = (1, 2, 1), v = (1, 1, 0), w = (3, 6, 3)}.p s : y = x+ z.
5. Trong R4, vi W = {u1, u2, u3} = {(1, 1, 1, 0), (0,2, 1, 1), (1, 0, 1,2)}. Chou = (x1, x2, x3, x4) R4. Tm iu kin u W .p s : 7x1 + 2x2 + 5x3 x4 = 0.
6. Trong R3 xt hai c s A, B. Bit ma trn chuyn c s t A sang B l P =
4 0 11 4 41 1 2
v ta x i vi c s A l [x]A = (13, 13, 13). Tm ta ca x i vi c s B.p s : [x]B = (1,6, 9).
7. Tm ta (x1, x2, x3, x4) ca vector u = (1, 1, 1, 1) theo c s {u1 = (0, 1, 1, 1), u2 =(1, 0, 1, 1), u3 = (1, 1, 0, 1), u4 = (1, 1, 1, 0)}.
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8. Tm ta (x1, x2, x3) ca vector u = (m,m, 4m) theo c s {u1 = (1, 2, 3), u2 =(3, 7, 9), u3 = (5, 10, 16)}.p s : x1 = m, x2 = m, x3 = m.
9. Cho bit ma trn chuyn c s t c s U = {u1, u2, u3} sang c s chnh tc E l
A =
1 1 20 1 01 1 1
. Tm ta (x1, x2, x3) ca vector u = (1, 0, 1).p s : x1 = 3, x2 = 0, x3 = 2.
10. Trong khng gian R3 cho hai c s, c s chnh tc E vF = {f1 = (1, 1, 1); f2 = (1,1, 1); f3 = (1, 1,1)}. Hy tm ma trn chuyn c s tF sang E?
p s : PFE =
0 0.5 0.50.5 0 0.50.5 0.5 0
.11. Tm s chiu v c s ca khng gian con khng gian R3 cc nghim ca h phng
trnh thun nht
x1 2x2 + x3 = 02x1 x2 x3 = 02x1 + 4x2 2x3 = 0
12. Tm s chiu v c s ca khng gian con khng gian R4 cc nghim ca h phng
trnh thun nht
x1 + 2x2 + 3x3 + 4x4 = 01
2x1 + x2 +
3
2x3 + 2x4 = 0
1
3x1 +
2
3x2 + x3 +
4
3x4 = 0
1
4x1 +
1
2x2 +
3
4x3 + x4 = 0
13. S = {x1, x2, x3, x4, x5} l mt h vector trong R4. Tm hng ca S nu x1 =(1, 1,1,1);x2 = (1,1, 1,1);x3 = (3, 1,1, 1);x4 = (3,1, 1,1);x5 = (2, 0, 0, 0).
3.2 Khng gian Euclide
1. Trong khng gian EUCLIDE R3 vi tch v hng thng thng, cho ba vector x =(2, b, c); y = (1,2, 2); z = (2, 2, a). Tm a, b, c ba vector trn to thnh mt h trcgiao.
2. Trc giao ha v trc chun ha Gram-Schmidt h cc vector x1 = (1, 2, 3) v x2 =(3, 1, 2).
p s : y1 =
(114,
214,
314
); y2 =
(311050
,81050
,51050
).
3. Trc giao ha v trc chun ha Gram-Schmidt h cc vector x1 = (1, 1, 1); x2 =(1, 1, 0) v x2 = (1, 0, 0).
4. Trong khng gian EUCLIDE R3 cho khng gian vector conW = {x R3|2x1+x2x3 =0}. Tm mt c s trc giao v mt c s trc chun ca W .
5. Trong khng gian EUCLIDE R4 cho khng gian vector con W = {x R4|x1 +x2 +x3 =0, x1 + x2 + x4 = 0}. Tm mt c s v mt c s trc chun ca W .
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Chng 4
NH X TUYN TNH
4.1 nh x tuyn tnh
1. Trong cc nh x sau, nh x no l nh x tuyn tnh
1. f : R3 R3, f(x1, x2, x3) = (x2 x3, x1 + x3, 3x1 x2 + 2x3)2. f : R3 R3, f(x1, x2, x3) = (x1 + x2, x2 + 2, x3 + 3)3. f : R2 R, f(x1, x2, ) = |x2 x1|4. f : R2 R2, f(x1, x2) = (2x1, x2)5. f : R2 R2, f(x1, x2) = (x21, x2)6. f : R2 R2, f(x1, x2) = (x2, x1)7. f : R2 R2, f(x1, x2) = (0, x2)8. f : R2 R2, f(x1, x2) = (x1, x2 + 1)9. f : R2 R2, f(x1, x2) = (2x1 + x2, x1 x2)10. f : R2 R2, f(x1, x2) = (x2, x2)11. f : R2 R2, f(x1, x2) = ( 3x1, 3x2)12. f : R3 R3, f(x1, x2, x3) = (x1, x1 + x3 + x2)13. f : R3 R3, f(x1, x2, x3) = (0, 0)14. f : R3 R3, f(x1, x2, x3) = (1, 1)15. f : R3 R3, f(x1, x2, x3) = (2x1 + x2, 3x2 4x3)
2. Hy tm ma trn chnh tc ca mi nh x tuyn tnh sau
1. f(x1, x2) = (2x1 x2, x1 + x2)2. f(x1, x2) = (x1, x2)
3. f(x1, x2, x3) = (x1 + 2x2 + x3, x1 + 5x2, x3)
4. f(x1, x2, x3) = (4x1, 7x2,8x3)5. f(x1, x2, ) = (x2,x1, 3x2 + x1, x1 x2)6. f(x1, x2, x3, x4) = (7x1 2x2 x3 + x4, x2 + x3,x1)7. f(x1, x2, x3) = (0, 0, 0, 0, 0)
8. f(x1, x2, x3, x4) = (x4, x1, x3, x2, x1 x3)
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3. Cho nh x tuyn tnh f : R4 R4, nh bi
f(x, y, z, t) = (x+ 2y+ 4z 3t, 3x+ 5y+ 6z 4t, 4x+ 5y 2z+ 3t, 3x+ 8y+ 24z 19t).
Xt khng gian vector con V = {(x, y, z, t)/f(x, y, z, t) = (0, 0, 0, 0)}. Tm s chiu vmt c s ca V .p s : khng gian vector V c s chiu bng 2 v mt c s ca n{v = (8,6, 1, 0), u = (7, 5, 0, 1)}.
4. Cho T : R2 R2 l nh x nhn vi ma trn(
2 18 4
)1. Vector no sau y Im(T ): (1,-4); (5,0); (-3,12).2. Vector no sau y Ker(T ): (5,10); (3,2); (1,1).
5. Tm nhn v nh ca cc nh x tuyn tnh sau
1. f : R3 R3, f(x1, x2, x3) = (x1 2x2 + x3, 2x1 x2 x3, x1 + x2 2x3)2. f : R3 R3, f(x1, x2, x3) = (x1 + x2 + x3, x1 + x2 + x3, x1 + x2 + x3)
6. Cho f : R4 R3, v A =1 3 2 22 1 2 1
1 2 0 1
. Vi f(x) = AX, X R4, hy xc nhnhn v nh ca nh x tuyn tnh f .
7. f l mt nh x ma trn xc nh nh sau
A =
1 1 35 6 47 4 2
; B =2 0 14 0 2
0 0 0
;C =
(4 1 5 21 2 3 0
); D =
1 4 5 0 93 2 1 0 11 0 1 0 12 3 5 1 8
Hy tm1. Mt c s v s chiu cho Im(f);2. Mt c s v s chiu cho Ker(f);
8. Cho f : R2 R2 l nh x tuyn tnh c tnh cht f(1, 1) = (2, 0); f(0, 1) = (3, 1).Tnh f(1, 0) v tm ma trn ca f trong c s chnh tc ca R2.
9. Cho nh x tuyn tnh f : R2 R2, ma trn ca f i vi c s F = {(2, 1), (1, 1)} l(2 21 1
). Hy tm biu thc ca f .
p s : f(x, y) = (5y, 3y).
10. Xt c s S = {v1, v2, v3}, trong R3 trong v1 = (1, 2, 3), v2 = (2, 5, 3), v3 = (1, 0, 10).Tm cng thc biu din nh x tuyn tnh f : R3 R2 xc nh bi T (v1) =(1, 0), T (v2) = (1, 0), T (v3) = (0, 1). Tnh T (1, 1,1), trong cc c s chnh tc caR3 ,R2.
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4.2 Gi tr ring - vector ring
1. Tm cc gi tr ring v vector ring ca cc ma trn
A =
(6 44 2
); B =
(5 22 8
); C =
(9 1212 6
)2. Tm cc gi tr ring v vector ring ca cc ma trn
A =
2 1 11 2 10 0 1
; B = 3 1 11 5 1
1 1 3
; C =6 2 22 3 4
2 4 3
3. Cho ma trn A =
8 9 910 13 104 6 3
, hy tm cc gi tr ring ca ma trn A?p s : {2, 1, 3}
4. Tm tr ring thc v vector ring ca ma trn A =
3 3 21 1 23 1 0
v xc nh cckhng gian vector ring tng ng.
5. Tm tr ring thc v vector ring ca ma trn A =
2 1 00 1 10 2 4
v xc nh cc khnggian vector ring tng ng.
6. Tm tr ring thc v vector ring ca ma trn A =
2 2 11 3 11 2 2
v xc nh cc khnggian vector ring tng ng.
7. Tm tr ring v vector ring ca cc ma trn sau, t hy cho ha cc ma trn (nu
c) A =
15 18 169 12 84 4 6
; B = 0 8 61 8 7
1 14 11
; C = 2 0 11 1 12 0 1
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Chng 5
DNG TON PHNG
1. Vit ma trn ca cc dng ton phng sau:
1. f(x1, x2) = 3x21 4x1x2 x22
2. f(x1, x2, x3) = x21 2x1x2 x1x3
3. f(x1, x2, x3) = 2x21 2x22 + 5x23 8x1x2 16x1x3 + 14x2x3
4. f(x1, x2, x3) = 2x1x2 6x2x3 + 2x3x15. f(x1, x2, x3) = 2x
21 + 3x1x2 + 4x3x1 + x
22 + x
23
6. f(x1, x2, x3) = 4x1x2 4x1x3 + 3x22 2x3x2 + 3x237. f(x1, x2, x3) = x
21 + x
22 + 3x
23 + 4x1x2 + 2x1x3 + 2x2x3
8. f(x1, x2, x3) = x21 2x22 + x23 + 2x1x2 + 4x1x3 + 2x2x3
9. f(x1, x2, x3) = x21 3x23 2x1x2 + 2x1x3 6x2x3
2. a v dng chnh tc dng ton phng
1. f(x1, x2, x3) = 2x1x2 6x2x3 + 2x3x12. f(x1, x2, x3) = 2x
21 + 3x1x2 + 4x3x1 + x
22 + x
23
3. f(x1, x2, x3) = 4x1x2 4x1x3 + 3x22 2x3x2 + 3x234. f(x1, x2, x3) = x
21 + x
22 + 3x
23 + 4x1x2 + 2x1x3 + 2x2x3
5. f(x1, x2, x3) = x21 2x22 + x23 + 2x1x2 + 4x1x3 + 2x2x3
6. f(x1, x2, x3) = x21 3x23 2x1x2 + 2x1x3 6x2x3
3. Cho dng ton phng Q(x) = x21 + 2x22 + 2x
23 + 2x1x2 2x1x3 = xTAx. Bng php bin
i trc giao, v vi c s trc chun{y1 =
(26,1
6,
16
), y2 =
(13,
13,1
3
), y3 =
(0,
12,
12
)}.
Hy a dng ton phng ny v dng chnh tc.p s : g(z) = 3z22 + 2z
23
4. Kho st tnh cht xc nh (du) ca dng ton phng sauf(x1, x2, x3) = 5x
21 + x
22 + 4x1x3 4x3x2 + 5x23
5. Kho st tnh cht xc nh (du) ca dng ton phng sauf(x1, x2, x3) = 3x
21 + x
22 + 5x
23 + 4x1x2 8x1x3 4x2x3
6. nh m dng ton phng sau xc nh mf(x1, x2, x3) = 5x21 x22 mx23 4x1x2 + 2x1x3 + x2x3
14
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Ti liu tham kho
[1] Trn Lu Cng (Ch bin), Nguyn nh Huy, Hunh B Ln, Nguyn B Thi, NguynQuc Ln, Ton Cao Cp 2 i S Tuyn Tnh, Nh xut bn gio dc, 2005.
[2] Nguyn nh Tr (Ch bin), L Trng Vinh, Dng Thy V, Bi tp Ton Hc CaoCp Tp 1 (Dng cho sinh vin cc trng cao ng). Nh xut bn gio dc Vit Nam,2010.
[3] Nguyn nh Tr (Ch bin), T Vn nh, Nguyn H Qunh. Bi tp TON CAO
CP Tp mt i s v hnh hc gii tch. Nh xut bn gio dc, 2010.
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