,AB=AC打错.是AB=BC.
设AC=2,则AB=BC=√2,
BD=[√2/(√2+2)]×√2=2-√2
AE=√[2+(2-√2)²]=√(8-4√2)=2√[2-√2]
CD=AC×sin(45º/2)=2×√[(1-1/√2)/2]=√[2-√2]
∴AE=2CD
,AB=AC打错.是AB=BC.
设AC=2,则AB=BC=√2,
BD=[√2/(√2+2)]×√2=2-√2
AE=√[2+(2-√2)²]=√(8-4√2)=2√[2-√2]
CD=AC×sin(45º/2)=2×√[(1-1/√2)/2]=√[2-√2]
∴AE=2CD