N(0) , N(t) t. , N/(t) N(t), N/(t) = -lN(t), l > 0 .
, N(t) = N(0)-lt. , , , . . . , , , , = 3,15 .
.
, 1, 2, 3 4, , 1. , , bij Ai Aj (i,j = 1, 2, 3, 4) : b12 = 30, b14 = 20, b23 = 50, b24 = 40, b13 = 70, b34 = 60.
, .
.
Ai (i = 1, 2, 3, 4). : . (. 7.2). , ( ) , ( ). , , () (). V1, V2,,Vk, V1 , V1, V2,,Vk , Vi, Vi+1 (i = 1, , k-1) V1, Vk . , , .
7.2
2. , . , 1: 1) 1, 4, 3, 2, 1; 2) 1, 3, 2, 4, 1; 3) 1, 3, 4, 2, 1. ( ): L1 = 160, L2 = 180, L3 = 200. , .
, ( ), , , . , .
3. . , , : 1, 4, 3, 2, 1 .