1 |
13 |
1 |
23 |
1 |
33 |
1 |
993 |
A.4 | B.5 | C.6 | D.7 |
1 |
k3 |
1 |
k(k2-1) |
1 |
2 |
1 |
(k-1)k |
1 |
k(k+1) |
1 |
23 |
1 |
33 |
1 |
993 |
1 |
2 |
1 |
2 |
1 |
99×100 |
5 |
4 |
1 |
b |
1 |
c |
1 |
c |
1 |
a |
1 |
a |
1 |
b |
2a |
b+1 |
c-1 |
a-b |
c |
4xy |
x+y |
t+2x |
t-2x |
t+2y |
t-2y |
A.4 | B.0 | C.2 | D.-2 |
(yz+1)(zx+1)(xy+1) |
(x2+1)(y2+1)(z2+1) |
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