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ХхВанессахХ
@ХхВанессахХ
July 2022
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Срочно!!! Даю 30 баллов!
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Aruga
4.(а2-1+1)(2-а)= (а2)(2-а)
n(1-n+1)n(n-1-2)
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n(1-n+1)n(n-1-2)