摘要:=x2-x-6.=x2-2x-8.=x2-4ax+3a2.集合A={x|<0}.B={x|>0}.C={x|<0}.⑴求集合A.B,⑵是否存在这样的实数a.使C?
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点M(x,y)在运动过程中,总满足下列关系式:
①
-
=3;
②
-
=±3;
③
-
=6;
④
=
⑤
+
=1(-2<m<-1);
⑥Ax2-By2=C(A•B>0).
则点M的轨迹是双曲线的有
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①
x2+(y+3)2 |
x2+(y-3)2 |
②
(x+3)2+y2 |
(x-3)2+y2 |
③
x2+(y+3)2 |
x2+(y-3)2 |
④
| ||
|
|
3 |
2 |
⑤
x2 |
m+1 |
y2 |
m+3 |
⑥Ax2-By2=C(A•B>0).
则点M的轨迹是双曲线的有
①②④⑤
①②④⑤
(请把所有正确结论的序号都填上).