探究:如图①,在△ABC中,AB=AC,∠ABC=60°,延长BA至点D,延长CB至点E,使BE=AD,连结CD,AE,求证:△ACE≌△CBD.应用:如图②,在菱形ABCF中,∠ABC=60°,延长BA至点D,延长CB至点E,使BE=AD,连结CD,EA,延长EA交CD于点G,求∠CGE的度数.
(玉林防城港)计算:.
(梧州)先化简,再求值:,其中.
(钦州)计算:
(柳州)计算:.
(南宁)先化简,再求值:,其中.