1 |
x2 |
1 |
x |
A.(-1,1) | B.(-1,-1) | C.(0,0) | D.(1,1) |
|
|
1 |
x2 |
1 |
x |
9-x2 |
A.一条射线 | B.一个圆 | C.两条射线 | D.半个圆 |
A. | B. | C. | D. |
5 |
4 |
5 |
4 |
x2 |
2 |
x2 |
2 |
x2 |
2 |
y2 |
m-1 |
A.m>3时,曲线C是焦点在y轴上的椭圆 |
B.m=3时,曲线C是圆 |
C.m<1时,曲线C是双曲线 |
D.m>1时,曲线C是椭圆 |
A. x2+y2=1 | B. x2-y2=0 |
C. y=|x| | D. lgx+lgy=0 |
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