34 · 9 - 34 · 10 - 34 = 340 -34 = 306, 27 · 9 - 270 -27 =243, 78· 9 - 780 -78 =702, 83 · 19 - 83 · 20 - 83 =1660 -83 = 1577, 42 · 49 - 2100- 42 = 2058, 17 · 39 - 680 - 17= 663, 62 · 19 - 1240 - 62 = 1178, 23 · 39  - 860 - 23 = 837,

умножение на 9; 19... (1)

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