计算：（2a）="_____," 24xy-(-6xy)="_______," , =___
如图，已知AB=AC=BC=AD,则∠BDC＝_______________．
分解因式 （2a-b）2+8ab=__________________．
等腰三角形的一腰上的高与底边夹角为12o，则顶角的度数为__________________．
如图，已知,垂足点为,若,则=______________．
若则____________．
="_____," 24x
y-(-6xy)="_______," ,
=___
,垂足点为
,若
,则
=______________．
则
____________．
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