求解 在Rt△ABC中,AB=AC,∠A=90°,点D,E是直线AC上两动点,且AD=CE

2025-02-19 18:40:50
推荐回答(2个)
回答1:

I A,保定二手物品交流 油性复膜胶跟水性热复胶因其烘干后

1

1H



1.0079

IIA

化学元素周期表

IIIA

IVA

VA

VIA

VIIA

2He



4.0026

2

3Li



6.941

4Be



9.0122

5B



10.811

6C



12.011

7N



14.007

8O



15.999

9F



18.998

10Ne



20.17

3

11Na



22.9898

12Mg



24.305

IIIB

IVB

VB

VIB

VIIB

VIII

IB

IIB

13Al



26.982

14Si



28.085

15P



30.974

16S



32.06

17Cl



35.453

18Ar



39.94

4

19K



39.098

20Ca



40.08

21Sc



44.956

22Ti



47.9

23V



50.9415

24Cr



51.996

25Mn



54.938

26Fe



55.84

27Co



58.9332

28Ni



58.69

29Cu



63.54

30Zn



65.38

31Ga



69.72

32Ge



72.59

33As



74.9216

34Se



78.9

35Br



79.904

36Kr



83.8

5

37Rb



85.467

38Sr



87.62

39Y



88.906

40Zr



91.22

41Nb



92.9064

42Mo



95.94

43Tc



99

44Ru



101.07

45Rh



102.906

46Pd



106.42

47Ag



107.868

48Cd



112.41

49In



114.82

50Sn



118.6

51Sb



121.7

52Te



127.6

53I



126.905

54Xe



131.3

6

55Cs



132.905

56Ba



137.33

57-71

La-Lu

镧系

72Hf



178.4

73Ta



180.947

74W



183.8

75Re



186.207

76Os



190.2

77Ir



192.2

78Pt



195.08

79Au



196.967

80Hg



200.5

81Tl



204.3

82Pb



207.2

83Bi



208.98

84Po



(209)

85At



(201)

86Rn



(222)

7

87Fr



(223)

88Ra



226.03

89-103

Ac-Lr

锕系

104Rf

?

(261)

105Db

??

(262)

106Sg

??

(266)

107Bh

??

(264)

108Hs

??

(269)

109Mt

?

(268)

110Ds

?

(271)

111Rg

?

(272)

112

Uub

(285)

113

Uut

(284)

114

Uuq

(289)

115

Uup

(288)

116

Uuh

(292)

117

Uus

118

Uuo





57La



138.905

58Ce



140.12

59Pr



140.91

60Nd



144.2

61Pm



147

62Sm



150.4

63Eu



151.96

64Gd



157.25

65Tb



158.93

66Dy



162.5

67Ho



164.93

68Er



167.2

69Tm



168.934

70Yb



173.0

71Lu



174.96





89Ac



138.905

90Th



140.12

91Pa



140.91

92U



144.2

93Np



147

94Pu



150.4

95Am



151.96

96Cm



157.25

97Bk



158.93

98Cf



162.5

99Es



164.93

100Fm



167.2

101Md



168.934

102No



173.0

103Lr



174.96

回答2:

证明:(1)过点C作AC的垂线,与AN的延长线交于G.
∠CAG+∠BAM=90°=∠ABM+∠BAM,则:∠CAG=∠ABM;
又∠ACG=∠BAD=90°;AC=AB.故⊿ACG≌ΔBAD(ASA),得CG=AD=CE;∠G=∠ADB=∠FDE;
又∵∠GCN=90度-∠ACB=45度=∠ECN;CN=CN;
∴ ⊿GCN≌ΔECN(SAS),得:EN=GN;∠G=∠CEN=∠FED;
故:∠FED=∠FDE,(等量代换),得DF=EF.
(2)注:原结论有误,更改为,求证:BF=AN+NF.
⊿ACG≌ΔBAD(已证),则BD=AG.
故:BF=BD+DF=AG+EF=(AN+NG)+EF=AN+(NG+EF)=AN+(NE+EF)=AN+NF.

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