Одно.
Объяснение:
(16n^2-128)/ n^2
отдельно поделим (16n^2) на (n^2) и (-128) на (n^2). Тогда получим следующее выражение:
16 - (128/n^2)
натуральным числом 128/n^2 может быть только тогда, когда n^2 будет делителем числа 128. Следовательно, методом перебора, находим что подходят только три таких натуральных числа: 1, 2, 4.
Но так как у нас есть еще одно ограничение (16 - (128/n^2) должно быть натуральным числом), не трудно догадаться, что n= 1 нам не подходит; n=2 тоже не подходит; остаётся n=4 — это единственное натуральное число, которое нам подходит.
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