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BEBERAPA SOAL ANALISIS REAL DAN PEMECAHANNYA BEBERAPA SOAL ANALISIS REAL DAN PEMECAHANNYA 1.

1. Sequence (xSequence (xnn) is defined b !"e f#$$#%in& f#'u$s f#' !"e n!" !e'. *'i!e !"e fi's! fi+e) is defined b !"e f#$$#%in& f#'u$s f#' !"e n!" !e'. *'i!e !"e fi's! fi+e !e's in ec" cse,

!e's in ec" cse, . .  x xnn

==

11

++

((

−−

11))nn  b.  b. n n  x  x n n n n )) 1 1 ((

−−

==

c. c.

))

1

1

((

1

1

+ + = = n n n n  X   X nn d. d.

-1

1

-- ++ = =

n

n

 x

 x

nn Ans%e'  Ans%e'  . .  x xnn

=

=

((  //--//--//...)...)  b.  b.    ...)...) 0 0 1 1    1 1  2 2 1 1  -1 1  1 1 ((

=

=

n n  x  x c. c.    ...)...) 2/ 2/ 1 1  -/ -/ 1 1  1-1 1  3 3 1 1  -1 1

=

=

n n  x  x d. d.    ...)...) -4 -4 1 1  15 15 1 1  11 11 1 1  3 3 1 1  2 2 1 1

=

=

n n  x  x -.

-. 6"e fi's! fe% !e's #f sequence (x6"e fi's! fe% !e's #f sequence (xnn) 'e &i+en be$#%. Assu) 'e &i+en be$#%. Assuin& !"! !"e in& !"! !"e n!u'$ 7!ee'nn!u'$ 7!ee'n indic!ed b !"ese !e's 7e'sis!s &i+e  f#'u$ f#' !"e n!" !e' x

indic!ed b !"ese !e's 7e'sis!s &i+e  f#'u$ f#' !"e n!" !e' xn.n. . . 00  44  88 1 111 . ...  b.  b.    ...... 0 0      2 2  2 2 - -1 1 c. c.    ...... 13 13 1 1  5 5 1 1    1 1  -1 1

d d.. 11    88 1 133 . ... Ans%e'  Ans%e'  . . xxnn 9 -n:2 9 -n:2  b.  b. -)) 1 1 ((

n

n

 x

 x

n n n n

−−

==

c. c. 1 1

++

==

n n n n  x  xnn d. d.  x xnn

==

nn- -2.

2. Lis! !"e fi's! !e's #f !"e f#$$#%in& induc!i+e$ defined sequences.Lis! !"e fi's! !e's #f !"e f#$$#%in& induc!i+e$ defined sequences. . . xx11 9 1 9 1 xxn:1n:192x92xnn:1:1  b.  b. 11 9 - 9 - n:1n:199 )) -(( -1 1 n n n n  y  y  y  y

++

c. c. ;;119 19 1 ;;-- 9 - 9 -)) (( )) (( 1 1 1 1 -n n n n n n n n n n  z   z   z   z   z   z   z   z   z   z 

−−

++

==

++ ++ ++ d. d. ss11 9 2s 9 2s-- 9 0 9 0 ssn:-n:- 9 s 9 snn : s : sn:1n:1 Ans%e'  Ans%e'  .. 11   1 122  // 1 1-1-1  b.  b. -- )) 2 2 -2 2 (( -1 1  -2 2  -2 2

+

+

1

1

(2)

c. 1 - 2  0 d. 2 0 5 12 . <#' n b

R

n 7'#+e !"! $i

=

/ n b Ans%e'  / $i

 

=

 

 

 

 

n b  '!in / $i / / / / / / / /  /   /   / /

=

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n b lain kata dengan n b maka  N  n  N  diperoleh   jadi n b   jadi n b n b n b b n maka  N  n b  N   pilih b kasus n b   jelas b kasus n b   jadi n b n b n b b n maka  N  n b  N   pilih b kasus b n n b b n b b n n b b n b n b  N  n n b adb n b  N  n  N  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε 

0. =se !"e defini!i#n #f !"e $ii! #f  sequence !# es! b$is" !"e f#$$#%in& $ii!s.

. ) / 1 1 $i( -

=

+

n  b. ) -1 -$i(

=

+

n

(3)

-c. -2 ) 0 -1 2 $i(

=

+

+

n n d. -1 ) 2 -1 $i(

-=

+

n n Ans%e'  .

( )

( )

( )

( )

( )

( )

( )

/ 1 1 $i ) ( 1 1 / 1 1 / 1 1 1 1 / / 1 1 / 1 1 $i , / 1 1 $i

-=

+

+

>

<

+

+

>

=

+

>

+

=

+

n terbukti   jadi  L V  n berlaku  K  n  N   K    jadi  K  n berlaku maka  K  n  sehingga  N   K   pilih  sebarang  ambil  n  K  n  N   K  berarti n bukti n ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε   b.

( )

( )

( )

( )

( )

( )

( )

/ 1 -$i -1 -/ -1 -1 -1 -1 -/ -1 -/ 1 -$i , / 1 -$i = + < − + ≥ ∋ ∈ ∃ > ∀ < < + = + − = + − − = − + ≥ > ∋ ∈ > < − + ⇒ ≥ ∋ ∈ ∃ > ∀ + = + n n terbukti   jadi n n berlaku  K  n  N   K    jadi n n n n n n n n berlaku maka  K  n  sehingga  K   N   K   pilih  sebarang  ambil  n n  K  n  N   K  berarti n n bukti n n ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  c.

2

(4)

( )

( )

( )

( )

( )

( )

( )

( )

-2 0 -1 2 $i -2 0 -1 2 /  12  12 1/  12 0 -12 0 -10 2 1 2 -2 0 -1 2  12 / -2 0 -1 2 / 0 -1 2 $i , -2 0 -1 2 $i

=

+

+

<

+

+

>

<

<

<

+

=

+

=

+

+

=

+

+

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+

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+

+

n n terbukti   jadi n n berlaku  K  n  N   K    jadi  K  n n n n n n n n berlaku maka  K  n  sehingga  K   N   K   pilih  sebarang  ambil  n n  K  n  N   K  berarti n n bukti n n ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  d.

( )

( )

( )

( )

( )

( )

( )

( )

-1 2 -1 $i -1 2 -1 /  0  0  0 2 -0 2 -2 -1 -1 2 -1  0 / -1 2 -1 / 0 -1 2 $i , -1 2 -1 $i -= + − < − + − ≥ ∋ ∈ ∃ > ∀ < < < = + − = + − − − = − + − ≥ > ∋ ∈ > < − + − ⇒ ≥ ∋ ∈ ∃ > ∀ + + = + − n n terbukti  jadi n n berlaku  K  n  N   K   jadi  K  n n n n n n n n berlaku maka  K  n  sehingga  K   N   K   pilih  sebarang  ambil  n n  K  n  N   K  berarti n n bukti n n ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  3. S"#% !"! . ) / 4 1 $i(

=

+

n

(5)

( )

( )

-) -$i( / 1 -) $i( ) -$i( 1 $i . -$i / . -1 . -/ ) -1 -$i( ) -$i( -) -$i( -) -$i( = = = = = + = = ∈ ∀ ≠ + = = = + = + = + = + n  jadi  z   x  z   x n n  Jadi  z  dan  x maka  N  n  z  n  z   x misal  n n n n n adt  bukti n n n n n n n n n n n  b. ) -1 -$i(

=

+

n n c. ) / 1 $i(

=

+

n n d. ) / 1 1 $i( -

=

+

n n n Ans%e'  .

( )

( )

/ ) 4 1 $i( / 1 / ) $i( ) 4 1 $i( 1 $i . / $i / . 4 1 . 1 / ) 4 1 $i( / ) 4 1 $i( = + = = = = + = = ∈ ∀ ≠ + = = = + = + n  jadi  z   x  z   x n  Jadi  z  dan  x maka  N  n  z  n  z  n  x misal  n adt  bukti n n n n n n n n n n  b.

( )

( )

/ ) 1 $i( / 1 / ) $i( ) 1 $i( 1 $i . / $i / . 1 1 . 1 / ) 1 1 1 $i( ) 1 $i( / ) 1 $i( / ) 1 $i( = + = = = = + = = ∈ ∀ ≠ + = = = + = + = + = + n n  jadi  z   x  z   x n n  Jadi  z  dan  x maka  N  n  z  n  z  n  x misal  n n n n n n adt  bukti n n n n n n n n n n n c.

0

(6)

d.

( )

( )

/ ) 1 . ) 1 ( $i( / 1 / ) $i( ) 1 . ) 1 ( $i( 1 $i  / $i /  1 1  1 / ) 1 1 1 $i( ) 1 . ) 1 ( $i( / ) 1 . ) 1 ( $i( / ) 1 . ) 1 ( $i( -= + − = = = = + − = = ∈ ∀ ≠ + = − = = + − = + − = + − = + − n n  jadi  z  x  z  x n n  Jadi  z dan  x maka  N  n  z n  z n  x misal  n n n n n n adt  bukti n n n n n n n n n n n n n n n n n n

4. P'#+e !"! $i xn9/ if #n$ if $i n

 x

9/.&i+e n ex7$e !# s"#% !"! !"e c#n+e'&ence #f n

 x

need n#! i7$ !"e c#n+e'&ence #f xn Ans%e' 

(7)

( )

( )

/ $i / / / / $i / / $i / / / / / $i

=

<

<

=

<

<

>

=

=

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n n n n n n n n n n n n n n n n  x   jadi  x  x  x  x maka  x  x berlaku  N  n bila  sehingga  N  n  sebarang  ambil   x im l  adt   x dipunyai  x   jadi  x  N  n  N   N    jadi  x  x  x berlaku  K  n  N   K  berarti  x im l  adt   x dipunyai bukti ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  ε  >di !e'bu?!i C#n!#" 1 $i ) 1 $i( $i $i ) 1 ( ) ( ke konvergen  yaitu it  mempunyai karena konvergen  x   jelas  x it  mempunyai tidak  karena divergen  x  Jelas  x n n n n n n

=

=

5. S"#% !"! if xn

/ f#' $$ n

 N  nd $i xn9/ !"en $i  xn 9/

Ans%e'  terbukti  x  N  n apabila  x  N  n   jadi  x  x  x  N  n apabila  x  N  n  pilih  sebarang  ambil   x dan  N  n  x dipunyai n n n n n n n n $i / / / / $i / -> < − ∋ ∈ ∃ > ∀ < ⇒ < ⇒ < ⇒ > < − ∋ ∈ = ∈ ∀ ≥ ε  ε  ε  ε  ε  ε 

4

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