2023学年度重庆市西南师大附中第一学期九年级12月月考数学试卷一、选择题〔每题4分，共40分〕1．的平方根是·············································································〔〕A．2B．C．D．2．计算的结果是····································································〔〕A．B．C．D．3．重庆奥体中心体育场长312米、宽80米的弧形挑棚居亚洲之最，使其成为重庆市一座标志性体育建筑，其建筑面积共62800．请用科学计数法表示该建筑面积〔保存两位有效数字〕是······················································〔〕A．B．C．D．4．以以下图形中，既是轴对称图形又是中心对称图形的是······················〔〕A．B．C．D．5．函数的自变量的取值范围是··········································〔〕A．B．C．D．且6．假设分式的值为零，那么x的值等于··································〔〕A．2B．C．或D．7．在同一直角坐标系中，函数和函数〔m是常数，且〕的图象可能是····································································〔〕A．B．C．D．8．为了求的值，可令S＝，那么2S＝，因此2S–S＝，所以＝，仿照以上推理计算出的值是〔〕A．B．C．D．9．如以下图，将一张正方形纸片对折两次，然后在上面打3个洞，那么纸片展开后是〔〕10．如图，等边三角形ABC的边长为4厘米，长为1厘米的线段MN在△ABC的边AB上沿AB方向以1厘米/秒的速度向B点运动〔运动开始时，点M与点A重合，点N到达点B时运动终止〕，过点M、N分别作AB边的垂线，与△ABC的其它边交于P、Q两点．线段MN在运动的过程中，四边形MNQP的面积为S，运动的时间为t．那么大致反映S与t变化关系的图象是······················〔〕二、填空题〔每题4分，共24分〕11．分解因式：________________．12．点P〔a，b〕在第二象限，那么点Q〔ab，a–b〕在第_____________象限．13．两圆的圆心距为4，两圆的半径分别是方程的两个根...
