矢量代数问题The position vectors of the points A and B,relative to
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矢量代数问题
The position vectors of the points A and B,relative to an origin O,are (3,4) and (k,2k) respectively.
Given that the magnitude of AB is 2,calculate the values of k.
The position vectors of the points A and B,relative to an origin O,are (3,4) and (k,2k) respectively.
Given that the magnitude of AB is 2,calculate the values of k.
(k-3)²+(2k-4)²=2².
5k²-22k+21=0.
(k-3)(5k-7)=0.
k1=3.k2=7/5.
兴趣肤阔,千千万人之上;o(≥v≤)o~好棒!
5k²-22k+21=0.
(k-3)(5k-7)=0.
k1=3.k2=7/5.
兴趣肤阔,千千万人之上;o(≥v≤)o~好棒!
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