2011版初中数学新课标金榜学案配套课件：单元评价检测[四][湘教版七年级上].ppt

(第 5、6 章) （45分钟 100分） Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 一、选择题（每小题4分，共28分） 1.下列不等式中，是一元一次不等式的是( ) (A) +12 (B)x29 (C)2x+y≤5 (D) (x-3)0 【解析】选D.根据一元一次不等式的概念，不等式的左右两 边是整式，可以排除A.根据只含有一个未知数，可以排除C. 根据未知数的最高次数是1，可以排除B，所以本题答案为D. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2.不等式3(x-2)≤x+4的非负整数解的个数为( ) (A)4 (B)5 (C)6 (D)无数 【解析】选C.解不等式3(x-2)≤x+4得x≤5所以其非负整数解 为0,1,2,3,4,5共6个.所以选择C. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3.某地连续九天的最高气温统计如下表： 则这组数据的中位数与众数分别是（ ） (A)24、25 (B)24.5、25 (C)25、24 (D)23.5、24 【解析】选A.中位数是24，众数是25. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 4.（2010·苏州中考）有一组数据：10，30，50，50，70， 它们的中位数是（ ） (A)30 (B)45 (C)50 (D)70 【解析】选C.因为数据：10，30，50，50，70排序后中间一 个数为50，所以中位数是50，故选C. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5.如果不等式（m-2)x2-m的解集是x-1则有( ) (A)m2 (B)m2 (C)m=2 (D)m≠2 【解析】选B.因为（m-2)x2-m的解集是由不等式两边同除以m-2得到x-1,所以m-20,即m2.所以选B. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pt