x2+2x+1 |
x2-x |
x |
x+1 |
x-1 |
x |
2 |
(x+1)2 |
x(x-1) |
x |
x+1 |
x |
x-1 |
x+1 |
x-1 |
x |
x-1 |
1 |
x-1 |
2 |
1 | ||
|
| ||
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 |
a2 |
bc |
b2 |
ca |
c2 |
ab |
A.0 | B.1 | C.2 | D.3 |
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