2-amaliy mashg‘ulot: Matritsalar ustida amallar. Teskari matritsani tоpish. Matritsani rangini hisоblash
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2-mavzu 18au-20amaliy 1c2d0070bd1e537f3cd191db45cb187a
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2-amaliy mashg‘ulot: Matritsalar ustida amallar. Teskari matritsani tоpish. Matritsani rangini hisоblash. Masalalar yechish namunalari. 1-misol. Quyidagi matritsalarni ko‘ramiz: 1 4 6 8 3 2 , 5 6 4 A
1 2 3 2 1 4 , 3 4 1 B
1 4 7 . 7 4 1 C
Mumkin bo‘lgan matritsalarni qo‘shing va ayiring. Yechilishi. 2 6 9
10 4 2 ,
8 10 5 A B 0 2 3
6 2 6 .
2 2 3 A B
2-misol. Ushbu 3 1 2 , 2 4 5
2 1 1 3 4 5 B
matritsalarning AB va
BA ko‘paytmalarini toping.
matritsa 2 2
2 1 3 1 2 1 3 2 4 5 4 5 AB
3 2 1 ( 1) ( 2) 4 3 ( 1) 1 3 ( 2) ( 5) 3 10
2 2 ( 4) ( 1) 5 4 2 ( 1)
( 4) 3 5 ( 5) 28 39
BA matritsa 3 3
2 1 3 1 2 1 3 2 4 5 4 5 BA 2 3 ( 1) 2 2 1 ( 1) ( 4) 2 ( 2)
( 1) 5 ( 1) 3 3 2 ( 1) 1 3 ( 4) ( 1) ( 2) 3 5 4 3 ( 5) 2 4 1 ( 5) ( 4) 4 ( 2)
( 5) 5
4 6 9 3 13 17 . 2 24 33
AB BA bo‘lganligi sababli A va
B matritsalar kommutativ emas.
1 2 1 3 0 2 4 2 5 A
matritsaga teskari matritsani toping. Yechilishi. Matritsaning determinantini hisoblaymiz: 1 2 1 det
3 0 2 1 4 2 7 1 ( 6) 4 0.
2 5
Demak, A matritsa maxsusmas matritsa ekan. Endi ik A algebraik to‘ldiruvchilarni hisoblaymiz: 11 0 2 4; 2 5 A 21 2 1 8; 2 5 A
31 2 1 4; 0 2 A 12 3 2 7; 4 5 A
22 1 1 9; 4 5 A 32 1 1 5; 3 2 A 13 3 0 6; 4 2 A
23 1 2 10; 4 2
33 1 2 6. 3 0
A
Teskari matritsani tuzamiz: 1 1
1 4 8 4 1 7 9 5 7 9 5 . 4 4 4 4 6 10 6 3 5 3 2 2 2 A
1 1 AA A A E ekanini tekshirish mumkin. 4-misol. Matritsa rangini toping. 0 2 4 1 4 5 . 3 1 7 0 5 10 2 3 0
0 2
1 4 5 1 4 5 2 3 0 3 1 7 3 1 7 0 5 10 0 2 4 2 3 0 0 5 10 A
1 4 5 1 4 5 1 0 3 1 0 0 0 5 10 0 1 2 0 1 2 0 1 0 . 0 11 22 0 1 2 0 0 0 0 0 0 0 1 2 0 1 2 0 0 0 0 0 0 0 1 2 0 1 2 0 0 0 0 0 0
Hosil qilingan matritsaning rangi 2 ga teng, demak, berilgan A matritsaning rangi ham 2
Mustaqil yechish uchun misollar. 1.
5 2 1 4 A va
3 1 5 2 B
matritsa berilgan, 2
matritsani toping. 2. 5 2 1 4
va 3 1 5 2
matritsalar berilgan, A B
matritsani toping. 3. 3
0 1 3 1 5 3 0 A bo‘lsa, 1 A teskari matritsani toping. 4. Agar 2 1
1 , 0 1 4 A
2 1 0 3 2 2
bo‘lsa, 3 2 A B ni hisoblang. 5. А= 4 . 3 . 7 2 . 1 . 5 4 . 3 . 2 В= 7 . 4 . 2 5 . 3 . 4 3 . 2 . 5 2Е+А-2В 2 =? 6. Teskari matritsa topilsin. А= 8 . 7 . 4 2 . 1 . 9 7 . 3 . 5 А -1 =? 7. Teskari matritsa topilsin. А= 7 3 2 9 1 5 4 7 6 A 1 ? А 8. А= 1 . 2 . 8 7 . 3 . 4 5 . 2 . 3 В= 6 . 4 . 3 8 . 5 . 2 3 . 4 . 5 2А 2 -4Е+3В=?
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