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8/2/2019 bai 10 - hinh 6
1/28
Tit 12. Bi 10
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2/28
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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Thank you very much! I can use Acrobat Distiller or the Acrobat PDFWriter but I consider your
product a lot easier to use and much preferable to Adobe's" A.Sarras - USA
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3/28
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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4/28
Tit 12: TRUNG IM ca ON THNG
1/ Trung im ca on thng
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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Get yours now !
Thank you very much! I can use Acrobat Distiller or the Acrobat PDFWriter but I consider your
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5/28
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
*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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Get yours now !
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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
Tit 12: TRUNG IM ca ON THNG
1/ Trung im ca on thng
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
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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bai 10 - hinh 6
7/28
Tit 12: TRUNG IM ca ON THNG
1/ Trung im ca on thngMA B
M l trung im ca AB th:
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)=
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
Get yours now !
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8/28
A B
Cch 2:. Gp giy.
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9/28
A B
Cch 2:. Gp giy.
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10/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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11/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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12/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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13/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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14/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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15/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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16/28
A
Cch 2:. Gp giy.
B
pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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17/28
AB
Cch 2:. Gp giy.
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18/28
A BM
Cch 2:. Gp giy.
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19/28
Tit 12: TRUNG IM ca ON THNG
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
Cch 1: Dng thc c chia khongcch.
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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20/28
Neu dung mot si day e chia mot thanh gothang thanh hai phan dai bang nhau th lam thenao ?
?
Tit 12: TRUNG IM ca ON THNG
1/ Trung im ca on thng
2/ Cch v trung im ca on thng
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21/28
Tit 12: TRUNG IM ca ON THNG
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
Cch 1: Dng thc c chia khongcch.
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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22/28
Tit 12: TRUNG IM ca ON THNG
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:
Cch 1: Dng thc c chia khongcch.
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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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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Ko co
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Cn n
A
B
M
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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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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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28/28
Tit 12: TRUNG IM ca ON THNG
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
Hng dn hc nh
- Phn bit: im nm gia. imchnh gia. Trung im.- Hc bi nm trc kin thc c bn.- Lm cc bi tp cn li trong SGK
Cch 1: Dng thc c chia khongcch.
Trn tia AB v AM=
Cch 2: Gp giy
Cch 3: Gp dy
AB
2
trang126-Tr li cu hi phn n tp chng I
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