1. Determinantni hisoblang

= ∆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.