2021年2020年九年级第一次中招数学模拟试卷.pdf

第1页（共4 页）2020 年九年级模拟训练试卷数学注意：本试卷分为试题卷和答题卡两部分，考试时间100 分钟，满分120 分。考生应首先阅读试卷上的文字信息，然后在答题卡上作答，在试卷上作答无效。一、选择题（每小题3 分，共30 分）l下列实数中的无理数是A1.21 B3 8 C3 32D2272斑叶兰被列为国家二级保护植物，它的一粒种子重约0.000 000 5 克将 0.000 000 5 用科学记数法表示为A5107 B5107 C0.5 106 D51063下列几何体中，主视图与俯视图不相同的是ABCD4下列运算正确的是A3x4y7xy B（a）3 a2a5C（x3 y）5x8y5 Dm10m7m35甲、乙两班举行电脑汉字输入比赛，参赛学生每分钟输入汉字个数的统计结果如下表：班级参加人数（人）平均数（个）中位数（个）方差甲班55135149191乙班55135151110同学分析上表后得出如下结论：甲、乙两班学生的平均成绩相同；乙班优秀的人数多于甲班优秀的人甲班成绩的波动比乙班大上述结论中，正确的是ABCD6如图，有一张矩形纸片，长10 cm，宽 6cm，在它的四角各减去一个同样的小正方形，然后折叠成一个无盖的长方体纸盒若纸盒的底面（图中阴影部分）面积是32 cm 2，求剪去的小正方形的边长设剪去的小正方形边长是 x cm，根据题意可列方程为A10 646x32 B（10 2x）（62x）32 C（10 x）（6x）32 D10 64x232 7若关于x 的一元二次方程x22（k1）xk210 有实数根，则k 的取值范围是Ak1Bk 1 Ck 0 时，不等式3 x b k 的解集；4 x（3）若点P 在 x 轴上，连接AP，AP 把ABC 的面积分成1：3 两部分，求此时点P 的坐标（9 分）如图，已知O与等腰ABD 的两腰AB，AD 分别相切于点F，E，连接AO 延长到点C，使OCAO，连接CD，CB（1）试判断四边形ABCD 的形状，并说明理由：（2）若AB4c m，填空：当O的半径为cm 时，ABD 为等边三角形；当O的半径为cm 时，四边形ABCD 为正方形（9分）日照间距系数反映了房屋为楼间水平距离，H为南侧楼房高度，H1 为北侧楼房底层窗台至地面高度如图 2，山坡EF 朝北，EF 长为15 m，坡度为i1：0.75，山坡顶部平地EM 上有一高为 22.5 m 的楼房AB，底部A 到E 点的距|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 4 页，共 6 页文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8第5页（共4 页）离为 4 m（l）求山坡EF 的水平宽度FH；（2）欲在AB 楼正北侧山脚的平地FN 上建一楼房CD，已知该楼底层窗台P 处至地面C 处的高度为0.9m，要使该楼的日照间距系数不低于l.25，底部C 距F 处至少多远？（10 分）某网店专门销售某种品牌的漆器笔筒，成本为 30 元件，每天的销售量y（件）与销售单价x（元）之间存在一次函数关系，如图所示（1）求 y 与 x 之间的函数关系式；（2）如果规定每天漆器笔筒的销售量不低于240 件，当销售单价为多少元时，每天获取的利润最大？最大利润是多少？（3）该网店店主热心公益事业，决定从每天的销售利润中捐出 150 元给希望工程，为了保证捐款后每天剩余利润不低于3600 元，试确定该漆器笔筒销售单价的范围（10 分）已知，在ABC 中，ACB90，ACBC点D 是直线AB 上的一个动点，连接CD在CD 的右侧作以CD 为斜边的等腰直角三角形CDE，点H 是BD 的中点，连 接EH问题如图当点D是AB的中点时，EHAD（2）猜想论证：如图2，当点D在边AB（l）中的结论是否仍然成立？若成立，请仅就图2 给予证明；若不成立，请直接写出新的数量关系，并说明理由；（3）拓展应用：若ACBC2 2，连接AE，BE，请直接写出当BCE 是等边三角形时，ADE 的面积图 1 图 2 备用图（11分）如图，抛物线yC，过点A 的直线与y 轴交下点D，与抛物线交于点M，且tanBAM1（1）求该抛物线的解析式；（2）P 为抛物线上一动点，E 为直线AD 上一动点，是否存在点P，使得以点A，P，E 为顶点的三角形为等腰直角三角形？若存在，请求出点P 的坐标；若不存在，请说明理由：（3）点N 为 x 轴上一动点，请直接写出当DNM最大时点N的坐标|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 5 页，共 6 页文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8第6页（共4 页）|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 6 页，共 6 页文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 ZM4T6I1A8J8文档编码:CX6V1P2T6U3 HY6G4A10K9B6 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