题目表达应该有误,估计是:---------------AB=BE.
(1)证明:AB=BE,BD=BD,∠A=∠BED=90°,则Rt⊿BAD≌Rt⊿BED(HL),得AD=DE;
又AB=AC,∠A=90°,则∠C=45°=∠CDE,得CE=DE.故:AD=CE.
(2)设CE=X,则AD=DE=X,DC=√2X.BE=AB=AC=X+√2X.
BC=BE+CE=2X+√2X,即2+√2=2X+√2X,X=1.即CE=1.
题目表达应该有误,估计是:---------------AB=BE.
(1)证明:AB=BE,BD=BD,∠A=∠BED=90°,则Rt⊿BAD≌Rt⊿BED(HL),得AD=DE;
又AB=AC,∠A=90°,则∠C=45°=∠CDE,得CE=DE.故:AD=CE.
(2)设CE=X,则AD=DE=X,DC=√2X.BE=AB=AC=X+√2X.
BC=BE+CE=2X+√2X,即2+√2=2X+√2X,X=1.即CE=1.