已知点A(-4,-5),B(6,-1),求以线段AB为直径的圆的方程。
解:所求圆的方程为:,
由中点坐标公式得线段AB的中点坐标为C(1,-3),
∴,
故所求圆的方程为。
The president was so absorbed in his work that not a sound ______.
A.did she dare to make
B.dared she to make
C.she dared make
D.she did dare to make
20摄氏度等于()华氏度。
A、65
B、68
C、70
D、72