连接F,E把ABCD分成四块,根据面积相加的关系得到
2AB^2-ABxBE-ABxCD-(AB-BE)x(AB-DF)=AExDF
化简
(AE+BE)xDF=AB^2
and AB^2=AE^2-BE^2=(AE+BE)x(AE-BE)
带进去刚好
连接F,E把ABCD分成四块,根据面积相加的关系得到
2AB^2-ABxBE-ABxCD-(AB-BE)x(AB-DF)=AExDF
化简
(AE+BE)xDF=AB^2
and AB^2=AE^2-BE^2=(AE+BE)x(AE-BE)
带进去刚好
• 详细一点:原贴CD应为DF -flagsix- ♂ (471 bytes) () 05/02/2014 postreply 17:12:43