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Сходимость числовых рядов в примерах и задачах. Учебное пособие

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ɋɜɨɣɫɬɜɨ  ȿɫɥɢ ɱɢɫɥɨɜɨɣɪɹɞ
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ɋɜɨɣɫɬɜɨȿɫɥɢɱɢɫɥɨɜɨɣɪɹɞ
ɩɪɨɢɡɜɨɥɶɧɚɹɩɨɫɬɨɹɧɧɚɹ
ɬɚɤɠɟɪɚɫɯɨɞɢɬɫɹ.
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ɋɜɨɣɫɬɜɨȿɫɥɢɱɢɫɥɨɜɵɟɪɹɞɵ
S ɢS  ɫɨɨɬɜɟɬɫɬɜɟɧɧɨɬɨ ɪɹɞɵ
SS r 
ɋɜɨɣɫɬɜɨ ȿɫɥɢ ɱɢɫɥɨɜɨɣ ɪɹɞ
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
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n
n
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Ɋɹɞ
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f
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ɧɨɜɪɚɫɫɦɨɬɪɟɧɧɵɯɪɚɫɯɨɞɹɳɢɯɫɹɪɹɞɨɜɫɯɨɞɢɬɫɹ
ɉɪɢɦɟɪɊɚɫɫɦɨɬɪɢɦɪɚɫɯɨɞɹɳɢɟɫɹɪɹɞɵɪɚɫɯɨɞɢɦɨɫɬɶɞɚɧɧɵɯɪɹɞɨɜ
ɛɭɞɟɬɞɨɤɚɡɚɧɚɞɚɥɶɲɟ
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f
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n
n
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ɬɚɤɠɟɫɯɨɞɢɬɫɹ
a
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f
 ɪɚɫɯɨɞɢɬɫɹ ɉɨ ɫɜɨɣɫɬɜɭ  ɪɹɞ
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a
n
n
ɬɚɤɨɣɱɬɨ
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n
n
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ɬɚɤ
b
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 ɟɫɥɢ
f
f
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n
a
n
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OLP
n
fo
a
n
na
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n
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ɬɨɪɹɞɵ

f
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ɪɚɫɯɨɞɢɬɫɹ ɬɨɝɞɚ ɪɹɞ
b
n
¦
n
ɞɢɬɫɹ
f
ɇɚɩɪɢɦɟɪ ɟɫɥɢ
f
n
f
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b
n
n
n
ɩɪɨɝɪɟɫɫɢɢɫ
ȿɫɥɢɠɟɪɚɫɫɦɨɬɪɢɦ
f
f
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b
n
nn
 ɹɜɥɹɟɬɫɹ ɫɯɨɞɹɳɢɦɫɹ ɪɹɞɨɦ ɬɚɤ ɤɚɤ ɷɬɨ ɪɹɞ ɝɟɨɦɟɬɪɢɱɟɫɤɨɣ
ɫɦɩɪɢɦɟɪ
q
 ɤɨɬɨɪɵɣ ɬɚɤɠɟ ɪɚɫɯɨɞɢɬɫɹ ɩɨ ɞɨɫɬɚɬɨɱɧɨɦɭ ɭɫɥɨɜɢɸ ɪɚɫɯɨɞɢ

b
n
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n
n
f
b
n
ɦɨɫɬɢɪɹɞɨɜ
n
Ɍɚɤɢɦɨɛɪɚɡɨɦɩɨɫɜɨɣɫɬɜɚɦɢɪɹɞ
ɪɚɫɯɨɞɢɬɶɫɹ
f
ɞ
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f
n
ɫɯɨɞɢɬɫɹɩɨɭɫɥɨɜɢɸ
a
n
¦
n
ɪɚɫɯɨɞɢɬɫɹɩɨɭɫɥɨɜɢɸɬɨɝɞɚ ɩɨ ɫɜɨɣɫɬɜɭ  ɪɹɞ
b
n
ɯɨɞɢɬɫɹ
ɋɥɟɞɨɜɚɬɟɥɶɧɨɩɨɫɜɨɣɫɬɜɭɪɹɞ
f
ɦɨɠɟɬɤɚɤɫɯɨɞɢɬɫɹɬɚɤɢɪɚɫɯɨ
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b
n
n
f
n
 ɬɨ ɨɧ ɹɜɥɹɟɬɫɹ ɪɚɫɯɨɞɹɳɢɦɫɹ ɪɹɞɨɦ ɚ
f
ɤɨɬɨɪɵɣɪɚɫɯɨɞɢɬɫɹɫɦɩɪɢɦɟɪɬɨ

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nn
OLPOLP z
u
n
fofo n
f

¦
n

f

ɦɨɠɟɬɤɚɤɫɯɨɞɢɬɶɫɹɬɚɤɢ
¦
b
n
n
f
¦
n
ɪɚɫɯɨɞɢɬɫɹ
ba
nn
ɬɚɤɠɟɪɚɫ
b
n

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