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Укажіть алгебраїчну структуру, яка є групою.

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Укажіть алгебраїчну структуру, яка є групою.

( $\mathbb {R}$ ; +, ⋅ )

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( $\mathbb {C}$ ; +, ⋅ )

❌

( $\mathbb {Q}$ ; +, ⋅ )

❌

( $\mathbb {Q}$ ; +)

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