???, 2.39p ?? 2457.51…?·?? ?? 2.2? ?? 1296.7? ??

21? ???? ? ???(2455.12)?? 2.39???(0.10%) ??? 2457.51? ????.

?????? ? ???(788.89)?? 0.56???(0.07%) ?? 789.45? ??? ????.

?? ?????? ?·?? ??? ? ???(1294.5?)?? 2.2? ? 1296.7? ????.

[??=???]