2024年秋季期港北高中高二年级10月份月考数学科试题出题人：莫怀拼审题人：梁文玲第I卷（选择题）一、单选题：本大题共8小题，共40.0分。1.以A（1，3），B（-5，1）为端点的线段的垂直分线方程是（A.3x-y-8=0B.3x+y+4=0C.3x-y+6=0D.3x+y+2=0D.-²或-23-2B.-2C.0A.（0.1)23.圆C：x²+y²=2关于直线x-2y+5=0对称的圆的方程为（）A.(x+2）²+（y-4）²=2B.(x-2）²+(y+4）²=2C.（x+4）²+(y-6）²=2D.(x-4）²+(y+6）²=24.已知直线l：4mx+（m+2）y+1=0，直线l:（m-2）x+（m+2）y+2=0且1//，则m的值为（PB.2#或-D.-²或-2C.A.-25.下列命题：①若直线1的方向向量a=（1,-1,2），直线m的方向向量b=（2,1，-）则1与m垂直；②若直线1的方向向量a=（0,1，-1），面a的法向量n=（1，-1,-1），则1⊥a；③若面a，β的法向量分别为n=（0，1,3），n=（1,0,2），则a⊥β；④若面a经过三点A（1,0，-1），B（0,1,0），C（-1,2,0），向量n=（1,u，t）是面a的法向量，则u+t=1.其中真命题的个数是（B.1C.2D.3A.0第1页，共4页
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