共50条信息
已知\(A\left( 0,1 \right)\),\(B\left( \sqrt{2},0 \right)\),\(O\)为坐标原点,动点\(P\)满足\(\left| \overrightarrow{OP} \right|=2\),则\(\left| \overrightarrow{OA}+\overrightarrow{OB}+\overrightarrow{OP} \right|\)的 最小值为( )
已知向量\(\overrightarrow{a},\overrightarrow{b}\)满足\(\left| \overrightarrow{a} \right|=1,\left| \overrightarrow{b} \right|=3\sqrt{2},|2\overrightarrow{a}+\overrightarrow{b}|=\sqrt{10}\),则\(\overrightarrow{a}\)与\(\overrightarrow{b}\)的夹角为
已知动点\(M\)到定点\((\dfrac{1}{4},0)\)的距离比它到\(y\)轴的距离大\(\dfrac{1}{4}\).
\((I)\)求动点\(M\)的轨迹方程;
\((II)\)若过点\(P(t,0)\)的直线\(l\)与抛物线\(C\)相交于\(A\),\(B\)两点,且以\(AB\)为直径的圆过原点\(O\),求证\(t\)为常数,并求出此常数。
设,是向量,则“\(|\)\(|=|\)\(|\)”是“\(|\)\(+\)\(|=|\)\(-\)\(|\)”的( )
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