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1、临淮二中数学七年级下册期中测试卷班级：得分：一、填空：本大题共10 小题，每题5 分，共 50 分19 的算术平方根是 A3 B 3 C 3 D 81 2、在以下各数0、2.0、3、722、1010010001.6、11131、27无理数的个数是 ()(A)1 (B)2 (C)3 (D)4 3、以下说法中，正确的选项是A4,3,2都是无理数B无理数包括正无理数、负无理数和零C实数分为正实数和负实数两类D绝对值最小的实数是0 4、根据以下图所示，对a、b、c三种物体的重量判断正确的选项是Aacabacbc5以下运算正确的选项是A236aaaB0)1()1(01Cabba532 D22)(abba
2、ba6、不等式7215x的正整数解的个数为A3 个B4 个C5 个D6 个7、以下各式正确的选项是 A222)(babaB22)(ababba C2222)(bababaD96)3(22aaa8、以下)4)(3(ba的展开式中正确的选项是(A)1234abab;B4312abab;C1234abab;D1234baab.9、假设多项式nxx62是一个整式的平方，则n的值是A36 B9 C 9 D 9 10、如左图，在边长为a的正方形中挖掉一个边长为b的小正方形()(ba，把余下的部分剪拼成一矩形如右图，通过计算两个图形(阴影部分)的面积，验证了一个等式，则这个等式是A222)(2(bababa
3、ba B 2222)(bababaC2222)(bababa D)(22bababaabbbabbccc二、精心填一填本大题共5 小题，每题5 分，共 25 分，请将结果写在横线上11、比较大小：5_2.填、或=12、计算：)12)(12(13、关于x的某个不等式组的解集在数轴上可表示为：01234123则这个不等式组的解集是14、今天，和你一同参加五校联考的学生总数为3000 人，其中男生人数不超过女生人数的1.5 倍，请问男生至多_人。15、假设,1,4 xyyx则22yx_ 三、认真算一算本大题共7 小题，共 35 分16、计算：110)31()2(222016201420152(利用乘
4、法公式简便计算)17、把以下各式分解因式1(5a+2b)2-9b2 29x2-y2+4y-4 18、先化简，再求值。2)1(4)12)(12(xxx，其中21xabab文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1
5、T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10
6、ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9
7、Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V
8、1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8
9、V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4
10、文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J
11、10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N419、解以下不等式组，并把它的解集在数轴上表示出来。1)24(3)95(2xxx202)8(21042xx五、探索规律与应用20、数学课堂上，张老师写出了下面四个等式，仔细观察以下等式，你会发现什么规律：22131，23142，24153，25164，1请你按照这个规律再写出两个等式：2 分_ 、_。2请将你发现的规律用仅含字母nn 为正整数的等式表示出来：2 分你发现的规律是。3请你利用所学习的知识说明
12、这个等式的正确性：4 分说明：21、10 分大课间活动中，小明和体育老师、班主任3 人玩跷跷板游戏，3 人体重一共为 210 千克，体育老师坐在跷跷板的一端，体重只有班主任一半的小明和班主任一同坐在跷跷板的另一端，这时，体育老师的那端仍然着地，后来，小明借来一副质量为 30 千克的哑铃，加在他和班主任的一端，结果，体育老师的那端被跷起离地。请你确定小明体重的范围文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M1
13、0 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10
14、U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L1
15、0V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:C
16、Q8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5
17、N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV
18、7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8
19、G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N422、10 分一种结晶体呈立方体的形状，其棱长为0.4mm.1这种结晶体的体积是多少立方米？用科学计数法表示2现有一个棱长为0.04dm 的立方体容器能容纳多少个这种结晶体？23.此题 12 分为了保护环境，某化
20、工企业决定购买10 台污水处理设备，现在A 和B 两种型号设备,其中每台价格及月处理污水量如表所示：A B 价格万元/台15 12 处理污水量 t/月250 220 经预算，该企业准备购买设备的资金不高于130 万元。（1）请你设计该企业有几种购买方案？画表格（2）哪种方案处理污水多？文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y
21、8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1
22、 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V
23、4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文
24、档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J1
25、0H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M
26、10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ1
27、0U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4参考答案及评分建议一选择题：每题 3 分，共 30 分15ACDCB610ABBBD二填空题：每题 3 分，共 15 分11、12、1 13、32x14、1800 15、14 三计算题16 解：原式=3123 分=4 4 分17 解：原式=)12007)(12007(200721 分=12
28、0072007223 分=14 分18 解：原式=)12(41422xxx2分=4841422xxx=58x4 分当21x时，原式=58x=5218=16 分四、解不等式组19、1解：去括号得：xxx6121810移项、合并同类项得：3015x系数化为 1得：2x4 分在数轴上表示不等式的解集：6 分0 1 2 x2解：解不等式 1，得2x2 分解不等式 2，得4x4 分因此，原不等式组的解集为24x6 分在数轴上表示不等式的解集：420 x8 分五、探索规律与应用学校：_班级：_：_考号：_-密-封-线-文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4
29、文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J
30、10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5
31、M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ
32、10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3
33、L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码
34、:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1
35、T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4 20、126175271862 分22)1(1)2(nnn4
36、分3因为121)2(2nnnn12)1(22nnn所以2)1(1)2(nnn8 分21、解：设小亮在这次竞赛中答对了x道题，则他答错了或没答共)20(x道题，由题意，可列不等式80)20(510 xx5 分解这个不等式得：12x8 分答：小亮在这次竞赛中至少答对了12 道题。9 分22、解：设小明的体重为x千克，则班主任的体重为x2千克，由题意，可列不等式组)2(2102xxxx)2(210302xxxx5 分解不等式 1得35x解不等式 2得30 x8 分因此3530 x9 分答：小明的体重在30 千克至 35 千克之间。10 分文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10
37、 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U
38、9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10
39、V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ
40、8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N
41、4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7
42、J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4文档编码:CQ8V4V3L10V1 HQ10U9Y8G5M10 ZV7J10H1T5N4