2024年成考高起点《数学(理)》每日一练试题08月31日

聚题库

08/31

单选题1、一部电影在4个单位轮映，每一单位放映一场，轮映次序有（）。<ul><li>A：4种</li><li>B：16种</li><li>C：24种</li><li>D：256种</li></ul>答案：C2、设集合A={0,1}，B={0,1,2}，则A∩B=（） <ul><li>A：{1,2}</li><li>B：{0,2}</li><li>C：{0,1}</li><li>D：{0,1,2}</li></ul>答案：C解析：<img src="https://img2.meite.com/questions/202303/286422489c9882b.png" />3、参数方程<img src="https://img2.meite.com/questions/202303/28642284a62b73b.png" />（<img src="https://img2.meite.com/questions/202303/28642284ac644c3.png" />为参数）表示的图形为（）<ul><li>A：直线</li><li>B：圆</li><li>C：椭圆</li><li>D：双曲线</li></ul>答案：B解析：<img src="https://img2.meite.com/questions/202303/286422859adf006.png" /><img src="https://img2.meite.com/questions/202303/286422859fe4502.png" />即半径为1的圆，圆心在原点4、（2-3i）2=（）<ul><li>A：13-6i</li><li>B：13-12i</li><li>C：-5-6i</li><li>D：-5-12i</li></ul>答案：D解析：<img src="https://img2.meite.com/questions/202303/15641169af99ac7.png" />主观题1、已知直线l的斜率为1，l过抛物线C：<img src="https://img2.meite.com/questions/202303/156411660ae04fb.png" />的焦点，且与C交于A,B两点.(I）求l与C的准线的交点坐标； (II）求|AB|.答案：(I）C的焦点为<img src="https://img2.meite.com/questions/202303/1564116c40cf40a.png" />，准线为<img src="https://img2.meite.com/questions/202303/1564116c45024f5.png" />由题意得l的方程为<img src="https://img2.meite.com/questions/202303/1564116c5cf0409.png" />因此l与C的准线的交点坐标为<img src="https://img2.meite.com/questions/202303/1564116c7901a26.png" />(II）由<img src="https://img2.meite.com/questions/202303/1564116c9294ce9.png" />，得<img src="https://img2.meite.com/questions/202303/1564116c9d411f3.png" />设A（x1,y1），B（x2,y2），则<img src="https://img2.meite.com/questions/202303/1564116cd0bfaf7.png" />因此<img src="https://img2.meite.com/questions/202303/1564116ce1375a9.png" />2、设函数f(x)=xlnx+x.(I）求曲线y=f(x）在点（(1,f(1))处的切线方程； (II）求f（x）的极值．答案：(I）f(1)=1,f'(x)=2+lnx，故f'(1)=2.所以曲线y=f(x）在点（1,f(1))处的切线方程为y=2x-1.(II）令f'(x)=0，解得<img src="https://img2.meite.com/questions/202303/1564116d2d14a94.png" />当<img src="https://img2.meite.com/questions/202303/1564116d3d33026.png" />时，f'(x)<O；当<img src="https://img2.meite.com/questions/202303/1564116d6f6aec3.png" />时，f'(x)＞O.故f(x）在区间<img src="https://img2.meite.com/questions/202303/1564116db9a0764.png" />单调递减，在区间<img src="https://img2.meite.com/questions/202303/1564116dc99fc91.png" />单调递增．因此f(x）在<img src="https://img2.meite.com/questions/202303/1564116ddb842d0.png" />时取得极小值<img src="https://img2.meite.com/questions/202303/1564116de4f1b79.png" />3、已知a,b,c成等差数列，a,b,c+1成等比数列．若b=6，求a和c．答案：由已知得<img src="https://img2.meite.com/questions/202303/1564116c009cc19.png" />解得<img src="https://img2.meite.com/questions/202303/1564116c0e039c1.png" />4、为了测河的宽,在岸边选定两点A和B,望对岸标记物C,测得<img src="https://img2.meite.com/questions/202303/2864228db8c0e49.png" />AB=120m,求河的宽 <img src="https://img2.meite.com/questions/202303/2864228dd64bdcb.png" />答案：如图， <img src="https://img2.meite.com/questions/202303/2864228df3f06d3.png" /> ∵∠C=180°-30°-75°=75° ∴△ABC为等腰三角形，则AC=AB=120m 过C做CD⊥AB,则由Rt△ACD可求得CD=<img src="https://img2.meite.com/questions/202303/2864228e8a387f3.png" />=60m，即河宽为60m 填空题1、<img src="https://img2.meite.com/questions/202303/2864228ce0438da.png" />的展开式是（）答案：<img src="https://img2.meite.com/questions/202303/2864228d0c480eb.png" />解析：<img src="https://img2.meite.com/questions/202303/2864228d4197eb2.png" /><img src="https://img2.meite.com/questions/202303/2864228d47da120.png" /><img src="https://img2.meite.com/questions/202303/2864228d5101aa0.png" /><img src="https://img2.meite.com/questions/202303/2864228d5bc2a57.png" /><img src="https://img2.meite.com/questions/202303/2864228d65510b6.png" />2、不等式<img src="https://img2.meite.com/questions/202303/28642289d6ca884.png" />的解集为（） 答案：<img src="https://img2.meite.com/questions/202303/28642289e5c9bcc.png" />解析：<img src="https://img2.meite.com/questions/202303/28642289efc4ba4.png" /><img src="https://img2.meite.com/questions/202303/28642289fa37c87.png" /><img src="https://img2.meite.com/questions/202303/2864228a0077853.png" />