1.
宸茬煡锛?/p>
AB=4
锛?/p>
AC=2
锛?/p>
D
鏄?/p>
BC
涓偣锛?/p>
111749AD
鏄暣鏁帮紝姹?/p>
AD
瑙ｏ細寤堕暱
AD
鍒?/p>
E,
浣?/p>
AD=DE
鈭?/p>
D
鏄?/p>
BC
涓偣
鈭?/p>
BD=DC
鍦ㄢ柍
ACD
鍜屸柍
BDE
涓?/p>
AD=DE
鈭?/p>
BDE=
鈭?/p>
ADC
BD=DC
鈭粹柍
ACD
鈮屸柍
BDE
鈭?/p>
AC=BE=2
鈭靛湪鈻?/p>
ABE
涓?/p>
AB-BE
锛?/p>
AE
锛?/p>
AB+BE
鈭?/p>
AB=4
鍗?/p>
4-2
锛?/p>
2AD
锛?/p>
4+2 1
锛?/p>
AD
锛?/p>
3
鈭?/p>
AD=2
2.
宸茬煡锛?/p>
D
鏄?/p>
AB
涓偣锛屸垹
ACB=90
掳锛屾眰璇侊細
1
2
CD
AB
飥?
寤堕暱
CD
涓?/p>
P
锛屼娇
D
涓?/p>
CP
涓偣銆傝繛鎺?/p>
AP,BP
鈭?/p>
DP=DC,DA=DB
鈭?/p>
ACBP
涓哄钩琛屽洓杈瑰舰
鍙堚垹
ACB=90
鈭村钩琛屽洓杈瑰舰
ACBP
涓虹煩褰?/p>
鈭?/p>
AB=CP=1/2AB
3.
宸茬煡锛?/p>
BC=DE
锛屸垹
B=
鈭?/p>
E
锛屸垹
C=
鈭?/p>
D
锛?/p>
F
鏄?/p>
CD
涓偣锛屾眰璇侊細鈭?/p>
1=
鈭?/p>
2
璇佹槑锛氳繛鎺?/p>
BF
鍜?/p>
EF
鈭?/p>
BC=ED,CF=DF,
鈭?/p>
BCF=
鈭?/p>
EDF
鈭?/p>
涓夎褰?/p>
BCF
鍏ㄧ瓑浜庝笁瑙掑舰
EDF(
杈硅杈?/p>
)
鈭?/p>
BF=EF,
鈭?/p>
CBF=
鈭?/p>
DEF
杩炴帴
BE
鍦ㄤ笁瑙掑舰
BEF
涓?/p>
,BF=EF
鈭?/p>
鈭?/p>
EBF=
鈭?/p>
BEF
銆?/p>
鈭?/p>
鈭?/p>
ABC=
鈭?/p>
AED
銆?/p>
鈭?/p>
鈭?/p>
ABE=
鈭?/p>
AEB
銆?/p>
鈭?/p>
AB=AE
銆傚湪涓夎褰?/p>
ABF
鍜屼笁瑙掑舰
AEF
涓?/p>
AB=AE,BF=EF,
鈭?/p>
ABF=
鈭?/p>
ABE+
鈭?/p>
EBF=
鈭?/p>
AEB+
鈭?/p>
BEF=
鈭?/p>
AEF
鈭?/p>
涓夎褰?/p>
ABF
鍜屼笁瑙掑舰
AEF
鍏ㄧ瓑銆傗埓
鈭?/p>
BAF=
鈭?/p>
EAF (
鈭?/p>
1=
鈭?/p>
2)
銆?/p>
4.
宸茬煡锛氣垹
1=
鈭?/p>
2
锛?/p>
CD=DE
锛?/p>
EF//AB
锛屾眰璇侊細
EF=AC
A
B
C
D
E
F
2
1
D
A
B
C
A
D
B
C