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向量的定義是既有方向又有大小的量,即向量;a²;=b²;只是表示的向量的大小,即丨a丨=丨b丨,並不表示方向;a=b表示方向一致且大小相等的量,a=-b表示方向相反但大小相等的量;兩個大小相等但具有一定角度(不包…
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