1 0 “ ” 2 2011 6 8 2011 3 31 3 4 5 6 1972 12 7 2009 1 15 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 × ÷ 1 ÷ 2 2 41 = 42 0