2-amaliy mashg‘ulot. Determinantlar nazariyasi a
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2-amaliy mashg‘ulot. Determinantlar nazariyasi a) 1 2 3 4
ikkinchi tartibli determinantni hisoblang:
1 2 1 4 2 3
2. 3 4
b) Uchinchi tartibli determinantni hisoblang: 3 2 1 2 5 3 . 3 4 2
Yechish. Determinantni birinchi satr elementlari boʻyicha yoyib hisoblaymiz: 3 2 1 5 3 2 3 2 5 2 5 3 3 2 1 4 2 3 2 3 4 3 4 2
3 5 2 3 4 2 2 2 3 3 1 2 4 5 3 3 2 2 5 1 7 3.
1 2
4 5 6 . 7 8 9
Yechish.
1 2 3 4 5 6 1 5 9
2 6 7
4 3 8 7 8 9
3 5 7
4 2 9 1
6 7 45 84 96 105 72 42 126.
2.1. 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 .
b c a x b y a b c a b c a x b y a b c a b c a x b y a b c
Chap determinantning uchunchi ustunini uchta ustun yigʻindisi koʻrinishida ifodalash mumkin, bu determinantni uchta determinant yigʻindisi koʻrinishida ifodalaymiz: 1 1
1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 . a x a x a x a b c a b a b b y a b c a b a b b y a b c a b a b b y
Ikkinchi determinantning uchunchi ustuni birinchi ustuniga proporsional, uchunchi determinantning uchunchi ustuni ikkinchi ustuniga proporsional. Shuning uchun ikkinchi va uchinchi determinantlar nolga teng.
0 3 5 0 0 2 . 1 2 3 0 0 0
b c d
0 3 det min 0 0 2 ' 1 2 0 . 1 a er antni d b satr bo yicha yoyamiz c a d b d b a c c
Ikkinchi tartibli determinantni hisoblang: 1. 7 6 . 5 4
2. 10 5 . 9 8
3. .
b a b a b a b
0 0
0 sin1
sin89 . cos1 cos89
5. 2 2 2 2 2 . x y x x x y y x y x x y x y 6. 2 2
2 sin
cos . sin cos
1 1
2 1 1 2 2 5 . 5
a a a 8. 0 0 0 0 sin 60 cos 45 . sin 45 30 tg
1 .
tga ctga
10. 1,(3)
2, 25 . 23 / 3 6
11. 1 2 1 . 2 1 a a a a a a a a a a a a Tenglamani yeching: 12. . 5 2 1 3
0 2
x
3 1
0 1 . x x x x 14. 2 1 1 2 1 6. x x x x
15. 0 2 3 3 2 . x y y x
sin 2 sin
cos cos
. 2 0 x x x x
Uchburchak qoidasidan foydalanib determinantlarni hisoblang: 17. 0 0 1 0 2 0 . 3 0 0
18. 0 0 0 0 .
0 0
y z
19. 0 1
0 2 3 4 . 0 5 0 20. 2 3 4 5 2 1 . 1 2 3
Uchinchi tartibli determinantlarni ixtiyoriy satr (ustun) elementlari boʻyicha yoyib hisoblang: 21. 1 2 3 4 5 6 . 7 8 9
2 1
5 3 2 . 1 4 3 23. 3 2 1 2 2 3 . 4 2 3 24. 1 1 1
3 . 1 3
6 25. 2 1 3 4 5 9 . 16 25 81 Tenglama va tengsizliklarni yeching: 26. 2 0 3 1 7 3 5 3 6 0.
0 1
2 2 3
0 5 3 2 1 . x
28. 1 0 2 3 3 1 1 1 2 0. 2 1 x x x
29. 6 3 1 2 1 0 2 . 4 2 0 x x x 30. 2 3 2 2 3
0 5 3 2 1 0. x x
II. Namunada keltirilgan d), e) misollardan foydalanib misollarni yeching.
Determinantlarni qulay usulda hisoblang: 1. 1 1 1 . 1
a a a a
1 2
8 1 4 . 2 1 1 2) 1 2 0 3 3 1 0 4 . 1 5 1 7 2 1 0 1 3. 5 3 2 1 2
4 . 7 3 6
4. 3 1 2 1 2 5 . 4 1 6 5. 1 2
3 7 2 . 2 3 7
6. .
a a a a a a a a 7. . a x x x x b x x x x c x
8. cos
sin cos
sin sin sin
cos cos cos sin
. 0 sin cos 9. 2 2 2 1 1 . 1 x x y y z z 10. 2 . m a m a a n a n a a a a a
2 2
2 2 2 1 1 .
1 ax a x ay a y az a z
sin 3 cos3
1 sin 2
cos 2 1 .
sin cos
1 13. .
.
Tengliklarni isbotlang: 15. 1 1 . 1 a bc b ca b a c a c b c ab
16. 2 2 2 1 1 . 1 a a b b b a c a c b c c
17. 2 2 2 1 1 1 1 . 1 1
bc a a b ca b b c ab c c
18. 3 2 3 2 3 2 1 1 1 1 . 1 1 a a a a b b a b c b b c c c c 19. 2 2 2 2 3 2 2 2 2 2 2 . a b c c a b c a bc a b c b b c a
20. 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 2 . a b x a b x c a b c a b x a b x c x a b c a b x a b x c a b c
n n n n a a a a a a a a a ...
...... .......... .......... ...
... 2 1 2 22 21 1 12 11 Satr yoki ustun elementlari boʻyicha yoyish orqali determinantlarni hisoblang: 21. 1 2 3 4 9 9 9 9 . 4 3 2 1 1 0 1 0
22. 1 2 3 4 0 2 5 9 . 0 0 3 7 2 4 6 1 23. 1 2 3 1 3 0 1 1 . 2 0 4 1 5 1 2 1
24. 1 2 3 4 2 3 4 1 . 3 4 1 2 4 1 2 3 25. 1 2 3 4 2 1 4 3 . 3 4 1 2 4 3 2 1 26. 1 1 1 1 1 2 4 8 . 1 3 9 27 1 4 16 64
27. 1 1 1 1 1 1 1 1 . 1 1 1 1 1 1 1 1 a a b b 28. 3 1 2 1 1 5 1 2 1 2 . 9 1 1 3 4 3 0 6 1 3 5 2 3 2 1 29. 0 6 3 5 1 3 2 4 1 0 . 5 1 4 3 2 3 8
7 6 1 1 0 3 4 0
30. 1 2 3 0 0 1 2 3 . 3 0 1 2 2 3 0 1
1. Mike Rosser. Basic mathematics for economists. London and New York. 1993, 2003. 2. M.Harrison and P.Waldron Mathematics for economics and finance. London and New York. 2011. 3. M.Hoy, J.Livernois et. al. Mathematics for Economics. The MIT Press. London&Cambridge. 2011. 4. Robert M. Leekley. Applied Statistics for Businiess and Economics. USA. 2010. 5. Alpha C. Chiang, Kevin Wainwright. Fundamental Methods of Mathematical Economics. N.-Y. 2005. 6. Xashimov A.R., Xujaniyazova G.S. Iqtisodchilar uchun matematika. O’quv qo’llanma. “Iqtisod-moliya”. 2017. 386 b. Download 275.2 Kb. Do'stlaringiz bilan baham: |
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