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Вектори a ⃗ = ( 1 , 2 , − 1 ) \vec{a} = (1, 2, -1) і b ⃗ = ( − 2 , − 4 , 2 ) є...
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Вектори a⃗=(1,2,−1)\vec{a} = (1, 2, -1)і b⃗=(−2,−4,2) є
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