n-4 |
n+17 |
kb2 |
ka2 |
b |
a |
n-4 |
n+17 |
n-4 |
n+17 |
n-4 |
n+17 |
27 |
48 |
9 |
16 |
3 |
4 |
n-4 |
n+17 |
7 |
28 |
1 |
4 |
1 |
2 |
A.100 | B.400 | C.700 | D.1000 |
1-(-1)n |
2 |
A.一定是偶数 |
B.一定是奇数 |
C.是偶数但不是2 |
D.可以是偶数也可以是奇数 |
A.3n | B.5n | C.8n | D.16n |
A.117649 | B.262147 | C.279643 | D.531469 |
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