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【简答题】
已知向量a={1,1,1},b={0,2,4}求:(1)向量3a,a+b (2)向量a的方向余弦 (3)a的同方向的单位向量。
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The growth of Arabica coffee plants requires strict weather conditions.
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The flavor of Arabica coffee is better than other’s.
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The Arabica coffee plants grow in the areas more subject to climate changes.
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The Arabica coffee plants produce more coffee beans than other coffee plants.
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