Ответ:
13. D. 1
16.
18. D. n⁴-2n³+2n²-1
19.
20. B. (3a-b)(1+a)
13.
18,
Ответ: положительных нет
20.
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Answers & Comments
Ответ:
13. D. 1
16.
18. D. n⁴-2n³+2n²-1
19.
20. B. (3a-b)(1+a)
13.
Ответ:

16.
Ответ:

18,
Ответ:

19.
Ответ: положительных нет
20.
Ответ: