2020年吉林省長春市中考數(shù)學模擬試卷

× A.

B.

C.

A. B. C.

×

n

A.

B.

C.

A.

B.

C.

A.

B.

C.

A.

B.

C.

=bm

A. m B.

bm C. m

bm =

=

A.

B.

C.

______

=

______

=-

+b

=

=-

+b

______

E

______

eq

\o\ac(△,Rt)

DEEF

CEEF

=10=6CE+EF______

=

E

CE

lCE

m=++m______

÷

6×6

m

m+

________________________

______

E

DE==2

m______m______m

m

E

E

DE

DE

FDE=EFEF

EFEF

E

DF=1=4

EFBE=CFBF

=3eq

\o\ac(△,，則)

______eq

\o\ac(△,，)

______

eq

\o\ac(△,是)

E

==3cm=5cmcm/ cm/

Ecm

E

Meq

\o\ac(△,是)

= ++

m

=eq

\o\ac(△,，求)

eq

\o\ac(△,，設(shè))

m

mm+1

m

×=2

×

n

×nnnnn×nn

=53=95EF=7DF=3

E

EG

==EF=7==53=DF=3

= = =

=53

=95EF=7DF=3E

EG

==EF=7==53=DF=3

eq

\o\ac(△,Rt)

=

=

=

=

=4

==4

=

+b0=

×6+bb=8= +8

= +b0= ×6+bb=8

=CBE=CBE==

=

F

=

eq

\o\ac(△,Rt)

=8

BE

+

+

BE

+

+

EF+CE=EF+EC

EFF

FE+EC

F

=

EF+CE=EF+EC

EFFFE+ECm=0

=1

=-1

，點

EE

=2=+=4

m

mE

=2

+=4

m=++b=

÷==

×

=1

=3= =2

=

n

m

3÷m

3÷3=1m

+ m

m

++=====2 = =

=）連接

，如圖，利用（=

m÷2=90m

EF=+b60÷90=

E

F

EF=90

=0=

m=30=1

m÷

m=1

EEF +3

==

DE++=eq

\o\ac(△,在)

eq

\o\ac(△,和)

=3×3=9=3×3=9DE=

ANEF

NM

==

=DF=1=EFANEF=ANEFEFAN++=eq

\o\ac(△,在)

=ANEF==E

=

=2AM==2-1=1= = = = =3

×9=6eq

\o\ac(△,在)

BCF

BCF=BFCeq

\o\ac(△,S)

=

CEGF=

×3=

FBC+BGE

==b

=

=6+b==3+2+b=3+6=15+b=15+b=

+=

+3

+3===eq

\o\ac(△,得)

ANEF

NM

=

=

=DF=1=EF=ANAN=

eq

\o\ac(△,證得)

=AN=E=

=2AM==1= =

=9

eq

\o\ac(△,證得)

BCF=BFCeq

\o\ac(△,S)

=

CEGF

eq

\o\ac(△,S)

=

FBC+BGE

==b

=

=6+b==3+2+b=15+b=15

+b= eq

\o\ac(△,是)

==3cm=5cm= = =4=+=7

=

= cmE

=CE=2

=CE=2=

=

= = =2=

E

E

=CE=2

=

=

=3=

×3=-

+

=-

+

=3-=4-=

=-

+

=-

+

=CE=2==2=2=

=

=

=

PF

F

=PF =

=

=3=PF=3BPF

=

=

=

==

=

=

=

=

=

=

=4=+=7

=

=CE=2=CE=2=

，得出

=

，解得：=

，得出

=2=

=

=3

=3-=4-

=-

++

= ++

=4=2=

=1

++

=1=1- =1+ =-

++

=-

+2

m=1=4

m=2=3

m=-2=5mm=2

m=-1