Lesson1 introduction

!" ' )

*"

( $'" ) ,,

#$ " *# + $ "

%

% & #

%

& $ " % #

# %1 #

.

# - $'" . ' /0 %

1 .0 #.

" 2 * # 3556 *# +

. %

3 4# .

5 3" # * 7 /0 ' # $ " #& * . #. # 3556 *# + % 3 "% * 7 /0 ' # %* ' % ) " $ "." ' . * *# + $ ) " 0 ." 3 " " % ' ) " 1 %) *# + " %0 1 3 " % ) " # # # 0 1 /0 ' %% ) " ( # (" 3 " 3 .

3556 % ) " ( # 0 # ) 3556 % ( # 3556 3 & '# ( *" # '# $'" % . & 4 )$ " 3 ! ! ) 88 3 " "# $ 3 ! ( (1* ( / $ $ $ " # & 4 )$ " 4 .

- $ % )

% " #

3556 3556 # 3556 # % ' %13556 & 3556 &

3556 9 *

+

."

." $'" 8 $'" 8

'

%0 %) & *"

3556 &

)

, *" -* ) % %1

' 0 " 0

*# 9 *

$'" 8 ++ $'" 8 $'" 8 $'" 8

$ 8 ! .

!

/

- 3 1

1 $ ." . " #

-

3

9 2

3 #

# !

3556 & 3556 & ) %1 ' ! + *" 3556 &

( '

" 8

-

(

( ; 4

$ )

*

/

#. ..

*

"

1 :

%1

"

#

) 1

(

#.

5 <

)

) ! !

#

*7

+ * * * *

#3 ",

:

7 7 . *" * !

7 . ! , 7 $'" 5 3 *7 ." * '* 3 " ) 7 . # / . $ " * $ " 1 . 4 *: = - - $ 4* % ) $ " *7 %! * % # # ) $ . # ( 7 1 : ." . # # *7 # %! # 6 +5 6* 3 #3 "$'"$ $ . * 7 . *" & : % *7 %! $ " *7 " > * *7 # ' * $ # *# + . - '# 7 6 + 76 2%%1 & 7 1 $ '* % * 7 . *" ) '# 9 ? " > * *7 #'* 7 *! ". !

7*" 9 " > * *7 #'* *! 3 1 * 7 . *" % $'" *# ( $ " > * #'* # - $'"* % ( ! *" *7 . *7 . * 7 % ! 0 > *$ 1# . 1 ."

- @( # % ) $ 1# % & + *7 . *" - # $ " " ' * & 4" *# . " # 1# 1* (" $ #4 ( - 0 *7 . *" , * 7 $'" % & * 7 ) 8 $ . > * - % & ) *# + $ 1 "3. $ "3 " * $ " #$ * 7 )

,

*7 $ " ) %) .

$ ) :

.

# " # *- # * *# *

"

8 9:; 0 .

- $ #.0 3 " *7 . /0 : & *" *7 # *7 . *" /0 *7 6* 76 - % *" 0 - % 3 "% *" . " <- = = *# 1 : 9 *7 ( 76 3 " * 7 . - /0 . * / % .0 "

" & 3 $" '"

# -

& . *#

." # %

- 3 * & #$ "

/0 & * $ .

0

!

&

.

1

% & #

# .

3556 # 3 " 88 9 % )$ " 0 4( *#*# *7 " # "3.

"% .

0 * %0 ) $ "

*7 & -

) .

3 !" &

" .0 +- )

, = /0

3 "# # - 4 * 3 #

*"

% $'" / ** . * - . & %) " 9 . / 5*

5 .

& / 3556 $

* <

." *" ' # # 3 " *# % # 3 "%0 3 #$'# & # # % 1 ( 1 $'"

#

3 # %

#

$ +% 4 2%% #

*7 % %0 & # *# * * 4 *# 3 " * *# 3 % #

-

%

.

." 4 ( & # 3 "% % , #4 (

.

." 4 (

&

%% &

-/ * .

-/ *

!0 4 *# .

. #

3 "

#%

& & & > ? > 8 > !"

*"

> #

? :8

-/ * #% #

3"

# 4( / * 4(

& >

/ * #4 (

%.

&

3 " -/ * 8 99

#% / * 4(

>

/ * 4(

>

# &$

#

, 3 "%

! *" . & / *

* @< ( $ "

!0

!

! *"

8 99 $ "

>

:

>

8 99 =

#

#

& %

#

# ## *# +

*%*

#

*"

#4 ( -/ * . / *.

4( & > ? :8 > 99 ( : @< ( >

*

0 /0 )

3 "

#

* / *.

(

99 ( *# 3 "%

! *"

#

%

.

/ *4 (

>

8 99 8 99 >

> #

*

>

/ *.

* .

, *

: 9 9 > 9 @< > 99 = 8 9 @< > @< =

* # @ .

$ *# *

>

8 > # 3 " *# 8 > # @ .

8 99 =

:

> ! *"

!0 .

1

$ "

.

.

# 3 "%

&

:

4

>

.

3 " *# )

%) *

=

# % * ,

."

#

& %)

%)

. #

, % ; < @ 9

'1 $ " ) 3 $" *# @< 9 9 @; 99 9 @< 9% 9; @@

# 8

! *"

;

# @

)

'1 % # 4 . ( @ # ! *" . *

>

:

>

:

>

: 9 9, > 9 @%

9

9

!

4( % 3 #! *"

" 4( % 3 " /0 ." 4 ( 4( (# . 1

"

9 ,

> # $'"

$ 1 %% # % 4" )

% 3 " & A '#

3 #

! )

- 3 #

" & # #

!0 ." 4 ( 4 $'"

4( % ! & !0 ." 4 ( /0 ! # # 3" & 4( % & ." 4 ( . . # 3 . * 0. ! *" *# 3 #! *" * (# ." 4 ( ! ) 1 ! *" $'" 4( % " & & ." 4 ( :( " $ ! $'" ' '# 1 : 3556 !* # & 4 *# 4( & ." 4 ( .0 "3.. ." 4 ( % 4"$'" ." 4 ( % " /0 % # " " % %) /0 % 4 " % # 3 "% ' %% 3 "( # " #$ 4"4 * % ) ! *" ! . : $*" / * ) 3 "% # # * '# 4"4 ** ) 3"# % ! *" : $ B = . . '* + @( # %) ." 4 ( /0 #

.0

% *

-

% % 3 # 3 "% 9

' %

%% !* # /0

# 0% !B = + % #

<

. '* % ." 4 ( 3 ." 4 ( % " * ) '# ++ % ) # %) #$ 3 " . . %) ." 4 ( ( @

#

* (

B = * ' ." 4 ( .

9 9 8 99 (

." 4 (

9(

#$ .

> %(

# * 3"# $'" -

" !B = *% 9(

*

8 99 > - =

* 0 $'" ) 8 3 $ *" * 0 4 ( : $ B =. * ! B = ++ # # 3 " <9 ( -9 ( # # 3 " ;9 # 4( % ) 8 3 % *" *

.

." %)

4( ) ( 9 9 8 -9 ( 4( <9 (

.

8 99 = .

.

." %)

4( ) 9 9 8 99 4( 99

.

8 99 = ( @ ." 4 (

!" . ' " 99 ( )

#

!" ( $ ")

99

%)

#

." 4 (

) > >

#

>

-(

>

<; =

> >

. ) <; = B , = 9=

, = ! $'"3 *# *

@

%&& ' *7 3 4# 4( & #.

*"

#3" *" *

&

& '

()*+,-./*0,) *, ()1*+.23)*4*0,) : *

3 " C 0 # *# # # 3 " ,% -/ * / *." 4 ( .

0 # ! *" ! . , !" # @ .

'1 0 * * .

- * * 0 # ! @- = !" * # # 3 " ;- ( . / *.

4( *

99 2 #

*#

#

#3 " @ 2 % 0

9 -(

."

." 4 (

#

3 " 9( %

++ 99 ( %

%

-/ *

# / * #