共50条信息
已知\(\vec{a}=(3,-2,1)\),\(\overrightarrow{b}=(-2,4,0)\),\(\overrightarrow{c}=(3,0,2)\),则\(\overrightarrow{a}-2\overrightarrow{b}+4\overrightarrow{c}=\)_______.
点\(P\)是棱长为\(1\)的正方体\(ABCD-A\)\(1\)\(B\)\(1\)\(C\)\(1\)\(D\)\(1\)的底面\(A\)\(1\)\(B\)\(1\)\(C\)\(1\)\(D\)\(1\)上一点,则\(\overrightarrow{PA}· \overrightarrow{P{C}_{1}} \)的取值范围是__________
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