2020屆中考數(shù)學(xué)(真題版)專項(xiàng)練習(xí)新定義與閱讀理解題

220172018

S220172018

S220182019

SSS2019S220172018201929210

aa2anan

S29

S210

SSS10S291010

S23410

S234511

S11

S

23410

Saa2a3a4an

aSaa2a3a4anaaSaa

ana

a

S

aa2a3a4

．（

mn

mn

mn

mn

abc

x

y

tmn

nm

mn

nm

mn

nm

mn

nm

mn

abcmn

mn

xxx

yy

y

abc

tttttmn

nm

mnnmmnmnmn

nm

mn

nm

mnnmmnmnmn

nm

mn

nm

mnmnnmmnmnm2n2mnmnmnm2n2mn

nm

mn

abccbaac

abc

abcac

acacac

AabBcdTxyx

y

bd

TABABTxyx

y

T

ABABCDEttl

Txy

DEy

xET

xeq

\o\ac(△,H) DTHE

CABx

ty

t

tx

y

xxDTHDHT

TmmEmmm

T

m

m

E

m

m

TDH

T

T

DEEHTD

ABCD

ABADCBCDABCD

ABCD

ACBDOACBDAB2CD2AD2BC2eq

\o\ac(△,Rt) ACBACABACFG

ABDECEBGGEACABGEABCD

ABADABDCBCDCBD

ACBDACBDABCD

ACBDAODAOBBOCCODAB2CD2AO2BO2DO2CO2AD2BC2AD2BC2AB2CD2

CGBEGABCAEGABCAE

CAGBACBAEBACGABCAE

GABCAEABGAECAECAMEABGAMECEBGCGEB

CG2BE2CB2GE2ACABBCCG

BE

GE2CG2BE2CB2GE

ABCM

BCBCNABCACH

AMMNAMNCBEBE

NCeq

\o\ac(△,E) BEC

eq

\o\ac(△,EM) ABMEBMSASAMEMAMMNEMMNAMN

A

B

C

D

M

B

C

B

C

N

A

B

C

D

1 1 1 1 1 1 1 1 1 1 1 1 1 1D

C

H

A

M

MN

A

MN

1 1 1 1 1 1 1 1 1 1A

B

EEBA

B

EMEC1 1 1 1 1 1 1 eq

\o\ac(△,A)1B1M1 eq

\o\ac(△,EB)1M1 eq

\o\ac(△,A)1B1M1 eq

\o\ac(△,EB)1M1M

EB

M

M

M1 1 1 1 1 1 1 1 eq

\o\ac(△,EB)C

1 1B

ECB

C

E1 1 1 1N

A

B

C

D

D

C

H

1 1 1 1 1 1 1 1M

C

N

1 1 1B

C

EMC

N

1 1 1 1 1EC

N

1 1

EB eq

\o\ac(△,A)

B

M

eq

\o\ac(△,EB)M

1 1 1 1 1A

M

EM1 1 1A

M

MN

EMMN

1 1 1 1 1 1 1A

MN

1 1 1

）如圖

C

n

n

n

y

x

k

,

P

n

,

,

,

,

C P

C

,

C

C

C C

C

n n–12k2

C

C

n n–1C

CC

Cn n–1

C

C

,

C

n–1yn–1yDEn

n–1 n–1 E

n–1 n–1 n–1 n–1eq

\o\ac(△,Rt) DAC

n nDAC

n neq

\o\ac(△,Rt) EA CEA C

E

DAC

EA Cn n

C

yfxxx

x

1 2

x

x

fx

fx

fx1 2 1 2

x

x

fx

fx

fx1 2 1 2fx

x

x

1 2

xfx

fx

1 2

x

x

x

x

x

x

1 2 2 1 1

2

fx

fx

1 2

fx

fx

fx1 2

x

fx

xxf

ff

(((fffx

xxfx

xxf

f

((

(

ff

fx

xx

x

x

1 2

1 2

x

x

1

2x

x

x

x

x

+x

1 2 1 2 1 2fx

fx

fx

fx

1 2 1 2

fx

xx

eq

\o\ac(△,1) ABCABACADABCEFBDADABEF

ABABEF

ABEF

EF

M

DM

AB

Q

EF

AC

N

N

ACDEBEQBABABACADABCADBCADBDABDBAFABEBAABEF

ABEF

ABACADABCBDCDDEBEBDCDBECECDDEBEEDFM

EFDMMEMDEMEDABACBC

DBQECN

CE QBNCANCNACCNABAC