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Dap an va thang diem mon Toan - TS vao L10 nam 2020-2021

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so

crAo

D

TAO

xi

rm

rUYEN

sINH

LoP

to

rHPT


NAU

Hec

zozo

<sub>- </sub>

zozt



Kh6a ngiry

171712020


oAp

Ax-THANG

DIEM



M6n

thi:

TOAN



0'5


1)


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gid

tr!

cfto bi6u thrbc

A

khi

r

<sub>- </sub>

4.


Thay

r -

4

(thoa mdn

DKXD)

vdo bitiu

thric

A,

tinhdugc:

.4 3


4


GI


0t


lr0



2)



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1



1


2


-



(c-r)(.6+r)



(c



(l;



B-

3


J"

-t



3

+



)-(


Ch*ngminh B

<sub>- </sub>

+



Jr

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J-"

+s



,(l;

<sub>- </sub>

r)




0'5
BNi

I



2,0 didm


3)


Tim

ttit

crt

gid

tr!

crta

r

it|

bi\u

thtbc

P

<sub>- </sub>

2A.B

+

J

<sub>" </sub>

dqt

gid

tr!

nhd nhdt.


P-2A.B+J;:#r+J;



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+>

0 voimoi

r

>

0.


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Jr



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ra

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2.

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xtty

rakhi

vd chi

khi

r -

0

KL:

r -

0

thi

bi6u

thric

P

dqt gi6

tri

nhO nh6t.


l15


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di

xe dpp cira

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la

r

*

I

(km/h).


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gian

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b9 ttr nhe

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dtin nhd Binh

l'

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iti

b? crta

An.




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di xe d4p tir nha Binh v0


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r

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>

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<sub>r+g </sub>

Gio).



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2,0 diam


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lopi

r

12 , thu 14i

r -

3

thoa mdn y6u u

bii

to6n.



KL



hqrp di


t6c di ctra

An

la

3 km/h.


0,5


2)


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diQn

tich

bi

mfit cfia qud bdng bdn.


S

<sub>- </sub>

4trR2

x

4x

3,14 x22

<sub>- </sub>

50,24(.-').


bc mdt cira

qui

b6ng ban do

li:



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r)



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b

<sub>- </sub>

1

+

+ -

1

+

<sub>u </sub>

:

2(thoam6nDKXD).



y

<sub>-l </sub>

v


KL:

hQ phucrng

trinh

co nghiQm duy nh6t

le

(r;

y):

(r'r).



Gidi hQ phwong

trinh



<+ ....

e




2r

*

3b

<sub>- </sub>

5


4r

<sub>- </sub>

b

:

3


2r* 3 :b



y

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4r- 1 :3



y

<sub>-l</sub>



DKXD:

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1


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ro

<sub>- </sub>

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thing

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:

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n6n


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<sub>- </sub>

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di6m

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la

(0;a).


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cua m A.


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tiit

cd

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tr! cfia

m

AO dwong

thdng

(d)

cdt

tryc

Or

tgi

itilm B

sao cho


tam

gidc

OAB

ld

tam gidc cfrn.


(*utrr).

oo

di6m

B

thuQc

tryc

or

ndn

<sub>vo </sub>

-

0.


Vi

di6m

B

thuQc ducmg theng

<sub>(d),y -- </sub>

rrln

+ 4

dan d6n 0

<sub>- </sub>

mna

*

4


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m*O

+

nB:a

*

OB

-prl

<sub>- </sub>



l#l




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OB

<sub>- </sub>

900 n€nclOtam giitc

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gitrccdnthi OA

<sub>- </sub>

OB. Md

OA:4


n€n

OB

<sub>- </sub>

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le


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t


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6n


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<span class='text_page_counter'>(3)</span><div class='page_container' data-page=3>

Chtmg minh

dugc

BHE

<sub>- </sub>

900 vir


Suy

ra BHE

+

BKE

<sub>- </sub>

1800.


Lap luan d6n Aen

fr

giAc

BHEK

la

ffi



^, ,.i


grac nQl trep.


BKE

:

900.


A


H



E
F


lr0



2)


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dgng he

thftc

lugng

cho

L,AEB

vu6ng

tqi

E, dulng

cao

EH

c6:


BH,BA

_

BE2.


Chtmg minh tuong

tg

c6:

BK.BC

:

BE2.


Y$Y

BH,BA

:

BK,BC,



Chftng

minh

BH.BA:

BK.BC.



lr0



3)


-



-^



chtmg

minh

dusc

BHK

<sub>- </sub>

BEK (l).

(

BHBK

le

tf

gitrc nQi ti6p)
Chimg minh

dugc

BEK

:

BCE

(2). (Cung phU

voi EBC

)


Chimg minh

dusc

frE

<sub>- ffi </sub>

(3). (

BCEF

la

tri

gitcnQi ti6p)


^

^



chimg

minh

dusc

HFE

<sub>- FHI </sub>

(4).

(tam giitc

FHI

c6n

tai /.

<sub>)</sub>


Ttr

(

l),(2),(3),

(4)

suy

ra

ffiK

-frt.

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A.ABCnhqn,

hai

di6m

I

vd

K



nim

ctrng phia AOi vOi

duong

thing

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n6n

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I,

K li

ba

ili6m

thing hing.


hdng.


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minh

ba 'm H

,I,K

ld

ba th
3,0 diam


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v



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J"

+,h.

1-

12

*!



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r

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|

(thoa mfrn

DKXD).



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phuong

trinh

co nghiQm duy ntr6t

lir

r

<sub>- </sub>

1.


-0.



3r

<sub>-2 -l</sub>


,



+

zJr +z

3r

<sub>-2 </sub>

<sub>-2r2 </sub>

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3r

<sub>-2 - </sub>

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+L



.

.

<+,(* -r)'

*

(.6-

r)'

*

(


2


DKXD:

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)

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<sub>-.</sub>



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<sub>f:.c6c </sub>

c6ch

ldm kh6c n6u

dring

hqc sinh v6n tluqc di6m tuong img

vdi

bitiu ditim

cria
ddn ch6m.


uong


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J


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6n


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f



K


2



3


a


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,

/



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