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预备微积分

课程 6: 单位向量

单位向量

您可能需要：计算器

选择向量 v, with, vector, on top, equals, left parenthesis, minus, 1, comma, minus, 7, right parenthesis的单位向量。

(选择 A)
left parenthesis, minus, start fraction, 1, divided by, square root of, 50, end square root, end fraction, comma, minus, start fraction, 7, divided by, square root of, 50, end square root, end fraction, right parenthesis
(选择 B)
left parenthesis, start fraction, 1, divided by, 7, end fraction, comma, 1, right parenthesis
(选择 C)
left parenthesis, minus, start fraction, 1, divided by, square root of, minus, 8, end square root, end fraction, comma, minus, start fraction, 7, divided by, square root of, minus, 8, end square root, end fraction, right parenthesis
(选择 D)
left parenthesis, minus, 1, comma, 0, right parenthesis

不会做了？