Extend the BE-to-CA extension line to F.
∠FCE=∠BCE CE=CE ∠CEF=∠CEB=90
∴⊿CEF≌⊿CEB
∴FE=BE
∠DAC=∠CEF=90
∴∠ACD+∠F=∠ABF+∠F=90
∴∠ACD=∠ABF
∠∠ACD =∠ABF AC = AB∠CAD =∠BAF = 90
∴⊿ACD≌⊿ABF
∴CD=BF
∴CD=2BE
( 1)①∫AB = AC∠A = 90
∴∠ABC=∠C=45
∫∠EDB =
1
2
∠C
∴∠EDB=22.5
∵BE⊥DE
∴∠EBD=67.5
∴∠EBF=67.5 -45 =22.5
② In △BEF and △DEB.
∠∠E =∠A = 90°
EBF=∠EDB=22.5
∴△BEF∽△DEB
As shown in the figure: divide BG into equal parts ∠ABC, and cross de at G point.
∴BG=GD△BEG is an isosceles right triangle.
Let EF=x, BE=y,
So: BG=GD=
2
y
FD=
2
y+y-x
∫△BEF∽△DEB
∴
Elevation indicator
exist
=
exist
emergency department
Namely:
x
y
=
y
y+
2
y
Get: x=(
2
- 1)y
∴FD=
2
y+y-(
2
- 1)y=2y
∴FD=2BE.
(2) The intersection point D is DG∑AC, the extension line of the intersection point BE is at point G, and the intersection point with BA is at point N,
∫DG∑AC，
∴∠GDB=∠C，
∫∠EDB =
1
2
∠C，
∴∠EDB=∠GDE，
∵BE⊥DE，
∴∠BED=∠DEG，
DE=DE，
∴△DEG≌△DEB，
∴BE=
1
2
GB，∠BND=∠GNB=90，∠EBF=∠NDF，
∴△GBN∽△FDN，
∴
gbyte
disk drive
=
niobium (Nb)
(same as down) downward
, namely
exist
disk drive
=
billion
2DN
∫DG∑AC，
∴△BND∽△BAC，
∴
billion
ab blood type
=
(same as down) downward
Canada
, namely
billion
(same as down) downward
=
ab blood type
Alternating current
=k，
∴
exist
disk drive
=
K
2
.