bai 10 - hinh 6

8/2/2019 bai 10 - hinh 6

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Tit 12. Bi 10

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8/2/2019 bai 10 - hinh 6

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Kim tra bi c

Bi tp: Trn tia Ax, v hai on thng AM v AB sao cho AM = 2cm; AB=4cm.

a) Tnh MB =?b) So snh AM v MB.

p n:4 cm

.

A.

B.

M

2 cm.

M

2 cm

x

a)V AB>A M nn trn tia Ax, im M nm gia A v Bnn AM + M B = ABSuy ra MB = AB AMMB = 4cm 2cmMB = 2cm.b) C MA = 2cm v MB = 2cm MA = MB.


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8/2/2019 bai 10 - hinh 6

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Tit 12: TRUNG IM ca ON THNG

1/ Trung im ca on thng

MA B

M l trung im ca AB th:

MA + MB = AB

im M nm v tr noso vi A,B trn hnh v ?

Hnh 61*nh ngha(SGK-124)

+ M nm ia A B

*Ch :

Trungim ca on thng AB cn

c gi l im chnh gia ca onthng AB

v MA = MB

(MA +MB=AB)

+ MA=MB

(M cch u A,B )

=>

i

m M

c g

i ltrung im ca on thngAB


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8/2/2019 bai 10 - hinh 6

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MA B

Bi tp1: Trong cc hnh sau,

hnh no c im I l trungim ca on thng MN?m n

h1

*nh ngha (SGK-124))

M l trung im ca AB th:MA + MB = AB

*Ch :

Trung im ca on thng AB cnc gi l im chnh gia ca onthng AB

m ni h2

m nih3

v MA = MB


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MA B


MA + MB = AB

*nh ngha (SGK-124)

Bi 60(SGK-125):Trn tia Ox v 2 im A, B

sao cho OA=2cm; OB = 4cm.a)im A c nm gia

2 im O v B khng?

*Ch :

Trung im ca on thng AB cnc gi l im chnh gi a ca on

thng AB

v MA = MB

b)So snh OA v AB?c)im A c phi l

trung im ca on thngOB khng? V sao?


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8/2/2019 bai 10 - hinh 6

6/28

Bi 60 (SGK-125): Trn tia Ox v 2 im A, B sao cho OA=2cm; OB = 4cm.

a) im A c nm gia 2 im O v B khng?b) So snh OA v AB?c) im A c phi l trung im ca on thng OB khng? V sao?p n:

v hai im A , B cng nm trn tia Ox va) im A nm gia 2 i m O v B

O

.

B

.

A

2 cm2 cm

x



E

F

in cc t, k hiu cn thiu hon thnh li gii bi ton sau:

..b) V im A nm gia2 i m O v B .

Nn OA + . . = OBSuyraAB= OB-OA

AB = 4cm . = 2 c mVy OB .AB = 2cm.

v A nm gia hai imv ..

c) A l trung im ca on thng OB

x

on thng OB c my

trung im (im chnhgia)?

AB

2cm

=

O, B

OA=AB

on thng OB ch c mttrung im (im chnh gia)

Nhng c v s im nm

gia O v B


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8/2/2019 bai 10 - hinh 6

7/28


1/ Trung im ca on thngMA B


MA + MB = AB

v MA = MB2/ Cch v trung im ca on

V d: on thng AB = 5cm.Hy v trung im M ca on thng y.

Ta c: AM + MB = AB

MA = MB

Gii:

thng

Cch 1: Dng thc c chia khongcch.

Trn tia AB v AM =

Cch 2: Gp giy

2uy ra = = = = , cm2

MA B

AB2

52

=2,5(cm)=


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8/2/2019 bai 10 - hinh 6

8/28

A B

Cch 2:. Gp giy.


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8/2/2019 bai 10 - hinh 6

9/28

A B

Cch 2:. Gp giy.


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8/2/2019 bai 10 - hinh 6

10/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

11/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

12/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

13/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

14/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

15/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

16/28

A

Cch 2:. Gp giy.

B


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8/2/2019 bai 10 - hinh 6

17/28

AB

Cch 2:. Gp giy.


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8/2/2019 bai 10 - hinh 6

18/28

A BM

Cch 2:. Gp giy.


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8/2/2019 bai 10 - hinh 6

19/28


1/ Trung im ca on thngMA B

M l trung im ca AB thi:

MA + MB = AB

v MA = MB2/ Cch v trung im ca on

A M B


Trn tia AB v AM =

Cch 2: Gp giy

Nhn xt: M l trung im ca onthng AB th: AB

2

MA = MB =

AB2

52=2,5cm=


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8/2/2019 bai 10 - hinh 6

20/28

Neu dung mot si day e chia mot thanh gothang thanh hai phan dai bang nhau th lam thenao ?

?



2/ Cch v trung im ca on thng


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8/2/2019 bai 10 - hinh 6

21/28


2)M l trung im ca AB th:MA + MB = ABv MA = MB

Hoc

3) V trung im M ca on thng AB

Bi 63(SGK-126): Chn cutr li ng:im I l trung im ca onthng AB khi:a) IA = IB

=

AB

2

MA = MB =

Kin thc cn ghi nh

1) nh ngha trung im ca on thng


Trn tia AB v AM=

Cch 2: Gp giy

Cch 3: Gp dy

AB

2

c) AI + IB = AB v IA = IBd) IA =IB =

p n ng c, dAB

2


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8/2/2019 bai 10 - hinh 6

22/28


1)M l trung im ca AB khi:MA + MB = ABv MA = MB

Hoc

2)V trung im M ca on thng AB

AB

2

MA = MB =

Kin thc cn ghi nh Bi 61(SGK-126)

Cho hai tia Ox v Ox i nhau. Trntia Ox vim A sao cho OA=2cm.Trn tia Ox vim B sao choOB=2cm. Hi O c l trung im caAB khng? V sao?

p n:


Trn tia AB v AM=

Cch 2: Gp giy

Cch 3: Gp dy

AB

2

x XA BO2cm 2cm

+ im O l gc chung ca hai tiai nhau Ox, Ox. im A nm trntia Ox, im B nm trn tia Oxnnim O nm gia A, B.

+ Li c OA=OB=2cm

Vy O l trung im ca on thngAB


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8/2/2019 bai 10 - hinh 6

23/28

Vi hnh nh v trung im ca on thngtrong thc t

M

A

BCu B bnh


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8/2/2019 bai 10 - hinh 6

24/28

Ko co


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8/2/2019 bai 10 - hinh 6

25/28

Cn n

A

B

M


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8/2/2019 bai 10 - hinh 6

26/28

Hng dn hc nh

- Phn bit: im nm gia. im chnh gia. Trung im.

- Hc bi nm trc kin thc c bn.

- Lm cc bi tp cn li trong SGK trang126

- Tr li cu hi phn n tp chng I.


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8/2/2019 bai 10 - hinh 6

27/28

Chn thnh cm n ccChn thnh cm n cc

thy c gio v cc emthy c gio v cc emh c sinhh c sinh


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8/2/2019 bai 10 - hinh 6

28/28


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Trn tia AB v AM=

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trang126-Tr li cu hi phn n tp chng I


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