n2+3n-10 |
n2+6n-16 |
n2+3n-10 |
n2+6n-16 |
n2+3n-10 |
n2+6n-16 |
(n-2)(n+5) |
(n-2)(n+8) |
8 |
11 |
8 |
11 |
x2+2x+1 |
x2-x |
x |
x+1 |
x-1 |
x |
2 |
1 |
a |
1 |
b |
1 |
c |
A.正数 | B.零 |
C.负数 | D.正、负不能确定 |
A.60 | B.40 | C.29 | D.25 |
1 |
a2-1 |
1 |
a3-1 |
1 |
a100-1 |
1 |
2009 |
1 |
2008 |
1 |
2007 |
1 |
2 |
1-x2 |
1+x2 |
A.-1 | B.1 | C.0 | D.2009 |
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