. . . . ( ) ([1 6, 15.1, 15.3, 15.6, 15.9]; [2 7, 15.1 15.4], [3, 9.1, 9.3, 9.7, 9.10, 9.12 9.15], [5, 5.1, 5.3, 5.7, 5.10, 5.12 5.15]).
. , . , ([1 6, 15.2] [3, 9.2]).
, . . () , .
([1 6, 15.6] [3, 9.7]), .
, . , , , ( ). , () . .
.
, f(x) , , n (xi, yi). , , (x 1, xn) () ().
V.