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天壹联盟 2024年普通高中学业水平选择性考试冲刺压轴卷(三)3数学

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天壹联盟 2024年普通高中学业水平选择性考试冲刺压轴卷(三)3数学试卷答案

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分析消元整理可得x+3y+q(1-2x)=0,由直线系的知识解方程组可得.

解答解:∵p,q满足p+2q-1=0,∴p=1-2q,
代入直线方程px+3y+q=0可得(1-2q)x+3y+q=0,
整理可得x+3y+q(1-2x)=0,
解方程组$\left\{\begin{array}{l}{x+3y=0}\\{1-2x=0}\end{array}\right.$可得$\left\{\begin{array}{l}{x=\frac{1}{2}}\\{y=-\frac{1}{6}}\end{array}\right.$,
∴直线px+3y+q=0必过定点($\frac{1}{2}$,-$\frac{1}{6}$)
故选:C.

点评本题考查直线系方程,涉及消元思想和方程组的解法,属基础题.

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