– . 28 + 1 + 2 = . . . . 1 , , 1 . 1–16- . 20 . 31,5 . = 10 x 10 , ; 16,5 . = 10 ,
87 (115) . 41 = 130 (46,5 = 146 ) 23 (33) . 41 (49) . , . . 41 (49) 82 (98) 1 . , . 68 (76) . 18 (23) . , ; .