1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n×(n+1) |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2007×2008 |
1 |
n |
1 |
n+1 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
2007 |
1 |
2008 |
1 |
2008 |
2007 |
2008 |
A.n2-(n-2)2=8n | B.(n+2)2-n2=8n |
C.(2n+1)2-(2n-1)2=8n | D.(2n+3)2-(2n+1)2=8n |
© 2017-2019 超级试练试题库,All Rights Reserved.