當(dāng)n為奇數(shù)時為1+(1+3+5+…+n);
當(dāng)n為偶數(shù)時為1+2×(1+2+3+…+
n |
2 |
將n=18代入,
1+2×(1+2+3+…+9),
=1+2×45,
=91;
答:那么第18個拐彎的地方是91.
故答案為:91.
43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
42 | 21 | 22 | 23 | 24 | 25 | 26 | 51 |
41 | 20 | 7 | 8 | 9 | 10 | 27 | 52 |
40 | 19 | 6 | 1 | 2 | 11 | 28 | 53 |
39 | 18 | 5 | 4 | 3 | 12 | 29 | 54 |
38 | 17 | 16 | 15 | 14 | 13 | 30 | 55 |
37 | 36 | 35 | 34 | 33 | 32 | 31 | 56 |
64 | 63 | 62 | 61 | 60 | 59 | 58 | 57 |
n |
2 |