共50条信息
已知向量\(\overrightarrow{a}=(1,2)\),\(\overrightarrow{b}=(3,-4)\),则\(\overrightarrow{a}\)在\(\overrightarrow{b}\)上的投影为\((\) \()\)
在\(∆ABC \)中,\(\left| \overrightarrow{AB}+ \overrightarrow{AC}\right|=\left| \overrightarrow{AB}- \overrightarrow{AC}\right| \),\(AB=4\),\(AC=3\),则\(\overrightarrow{BC} \)在\(\overrightarrow{CA} \)方向上的投影是\((\) \()\)
在\(\triangle ABC\)中,\(AB=3,AC=2,\angle BAC={{60}^{0}}\),\(M\)是\(BC\)的中点,\(N\)在直线\(AM\)上,且\(BN\bot AM\),则向量\(\overrightarrow{BN}\)在向量\(\overrightarrow{AC}\)上的投影为\((\) \()\)
\(4.\)在边长为\(2\)的菱形\(ABCD\)中,\(∠BAD={120}^{0} \),则\(\overrightarrow{AC} \)在\(\overrightarrow{AB} \)方向上的投影为\((\) \()\)
已知向量\( \overset{→}{a}, \overset{→}{b} \)的夹角\(\left| \overset{→}{a}\right|=1 \)为\(120^{\circ} \),且,\(\left| \overset{→}{b}\right|=2 \),则向量\( \overset{→}{a}+ \overset{→}{b} \)在向量\( \overset{→}{a} \)方向上的投影是
向量\( \overset{→}{a}, \overset{→}{b} \)的夹角为\(120^{\circ} \),且\(\left| \overset{→}{a}\right|=1 \),\(\left| \overset{→}{b}\right|=2 \),则向量\( \overset{→}{a}+ \overset{→}{b} \)在向量\( \overset{→}{a} \)方向上的投影是\((\) \()\)
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