摘要:已知半径为1的动圆与圆(x-5)2+(y+7)2=16相切.则动圆圆心的轨迹方程是( ) A.(x-5)2+(y+7)2=25 B.(x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15 C.(x-5)2+(y+7)2=9 D.(x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9
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已知半径为1的动圆与圆(x-5)2+(y+7)2=16相切,则动圆圆心的轨迹方程是
A.(x-5)2+(y+7)2=25
B.(x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15
C.(x-5)2+(y+7)2=9
D.(x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9
查看习题详情和答案>>已知半径为1的动圆与圆(x-5)2+(y+7)2=16相切,则动圆圆心的轨迹方程是( )
A.(x-5)2+(y+7)2=25 B.(x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15
C.(x-5)2+(y+7)2=9 D.(x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9
查看习题详情和答案>>已知半径为1的动圆与圆(x-5)2+(y+7)2=16相切,则动圆圆心的轨迹方程是( )
A.(x-5)2+(y+7)2="25" | B.(x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15 |
C.(x-5)2+(y+7)2="9" | D.(x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9 |