若a、b、c满足a²+1/4b²+5=4a+b-｜c-2｜,试判断△ABC的形状,并说明理由.

x��)�{ѽ4�qCc'?۽�Ŷ͉jʆ��چ�&IP���I�v����s�u���΋�S�v,y6m��i�����jy�w��m:Own{�~˳}�'�=��Q�&�H��v�����'�qF`ӀԤ�9��4Ad!��%V�&i�jU@����4AUk��V#Q�H�| C}�$]C]风-@Ŷ e@F2����H! ��m�`j!^~6c��/��|�����I@���$�ف��f�