x+2a+1 |
x-3a+1 |
x+2a+1 |
x-3a+1 |
x+5 |
x-5 |
-x+5 |
-x-5 |
x-5 |
x+5 |
x+5 |
x-5 |
5(2x+1) |
2x-1 |
2x+1 |
2x-1 |
t+1 |
(t-1)2 |
t+1 |
(t-1)2 |
Sn2 |
n2 |
A.0 | B.
| C.
| D.1 |
2x-2-x |
2x+2-x |
A.关于原点对称 | B.关于直线y=-x对称 |
C.关于y轴对称 | D.关于直线y=x对称 |
A.[4,+∞) | B.(0,4) | C.(1,4) | D.(0,1) |
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