Предмет: Алгебра, автор: Аноним

помогите, пожалуйста,не могу​

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Автор ответа: DiasaliKarim
2

Ответ:

81

9×9×9×9×9=9^5

9×9×9=9^3

9^5-9^3=9^2

9^2=81

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