CE^2=AC^2+AE^2=4a
所以BE=CE=2√a
BC^2=AB^2+AC^2=6a-1+4√〔a(2a-1)〕+2a+1=8a+4√〔a(2a-1)〕
BD*BC =BC^2/2=4a+2√〔a(2a-1)〕
BE*BA=2√a〔2√a+√(2a-1)〕=4a+2√〔a(2a-1)〕
所以BE*BA=BD*BC
CE^2=AC^2+AE^2=4a
所以BE=CE=2√a
BC^2=AB^2+AC^2=6a-1+4√〔a(2a-1)〕+2a+1=8a+4√〔a(2a-1)〕
BD*BC =BC^2/2=4a+2√〔a(2a-1)〕
BE*BA=2√a〔2√a+√(2a-1)〕=4a+2√〔a(2a-1)〕
所以BE*BA=BD*BC