%A ?. ?. ????? %A ?. ?. ?????? %J ??i???? ????? I?-?? ?????????? ??? ??????? %T ??????? ???????-???????? ? ?????????????????? ?????? ??????? ?? ?????? %X We give a proof of the Newton-Leibniz formula on certain classes of rectifiable Jordan curves. An analyticity criterion and sufficient conditions for a quasianalyticity of classes of functions given on a locally "chordarc" curve (i.e. a curve, for which the ratio of the length of arc with a fixed endpoint to the length of chord subtending the arc is bounded by a number depending on the mentioned endpoint) is established. ??????, ?? ???????? ??? ????????? ?????). %N 4 %P 396-404 %V 3 %D 2006 %L zu28784