= ∆1=70
=∆2=749
=∆3=490
=∆4=-168 x1=∆1/∆=2; x2=21.4; x3=14; x4=-4.8
7. Tenglamalar sistemasini teskari matritsa usulida yeching: Ax=B
a)→ X= B= X=A-1×B
A-1= = 1; A11=-3; A12=0; A13=-4; A21=2; A22=1; A23=3; A31=-3; A32=-2; A33=-5
Agebraik to’ldiruvchilardan matritsa yasaymiz: endi buni transponerlaymiz:
Bu matritsaga dastlabki matritsaning determinantini teskari ko’paytirishimiz kerak, lekin bu matritsada determinant 1 bo’lgani uchun bu qadam shart emas.
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