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中考数学基础题强化提高测试16
中考数学基础题强化提高测试 16 总分 75 分 时间 35 分钟 一、选择题:每小题 3 分,共 15 分.每小题给出四个答案,其中只有一个是正确的. 1. 1 2 的倒数为( ) A. 1 2 B.2 C. 2 D. 1 2.下列图案是我国几家银行的标志,其中不是..轴对称图形的是( ) 3.数学老师布置 10 道填空题,测验后得到如下统计表: 答对题数 7 8 9 10 人 数 4 20 18 8 根据表中数据可知,全班同学答对的题数所组成的样本的中位数和众数分别是( ) A.8、8 B. 8、9 C.9、9 D.9、8 4.下列函数:① y x ;② 2y x ;③ 1y x ;④ 2y x .当 0x 时,y 随 x 的增大而减小的函数 有( ) A.1 个 B.2 个 C.3 个 D.4 个 5.一个正方体的表面展开图可以是下列图形中的( ) 二、填空题:每小题 3 分,共 24 分. 6.计算: 2( )a a . 7.梅州是中国著名侨乡,祖籍在梅州的华侨华人及港澳台同胞超过 360 万人,360 万用科学计数法表示为. 8.如图 1,在 O⊙ 中, 20ACB °,则 AOB _______度. A. B. C. D. A. B. C. D. O C A B 图 1 图 2 O 9.如图 2 所示,五角星的顶点是一个正五边形的五个顶点.这个五角星可以由一个基本图形(图中的阴 影部分)绕中心 O 至少经过_______次旋转而得到, 每一次旋转______度. 10.小张和小李去练习射击,第一轮 10 发子弹打完后,两人的成绩如图 3 所示 .根据图中的信息,小张 和小李两人中成绩较稳定的是. 11.已知一元二次方程 22 3 1 0x x 的两根为 1 2x x, ,则 1 2x x ___________. 12.如图 4,把一个长方形纸片沿 EF 折叠后,点 D C、 分别落在 1 1 D C、 的位置.若 65EFB °,则 1AED 等于_______度. 13.如图 5,每一幅图中有若干个大小不同的菱形,第 1 幅图中有 1 个,第 2 幅图中有 3 个,第 3 幅图中 有 5 个,则第 4 幅图中有个,第 n 幅图中共有个. 三、解答下列各题:本题有 5 小题,共 81 分.解答应写出文字说明、推理过程或演算步骤. 14.本题满分 7 分. 如图 6,已知线段 AB ,分别以 A B、 为圆心,大于 1 2 AB 长为半径画弧,两弧相交于点 C、Q,连结 CQ 与 AB 相交于 点 D,连结 AC,BC.那么: (1)∠ ADC ________度; (2)当线段 4 60AB ACB , °时, ACD ______度, ABC△ 的面积 等于_________(面积单位). 15.本题满分 7 分. 星期天,小明从家里出发到图书馆去看书,再回到家.他离家 图 3 A E D CFB D1 C1 图 4 … … 第 1 幅 第 2 幅 第 3 幅 第 n 幅 图 5 C BDA 图 6 Q y(千米) t(分) 3 12 72O 的距离 y(千米)与时间 t(分钟)的关系如图 7 所示. 根据图象回答下列问题: (1)小明家离图书馆的距离是____________千米; (2)小明在图书馆看书的时间为___________小时; (3)小明去图书馆时的速度是______________千米/小时. 16.本题满分 7 分. 计算: 1 0 1( 3 2) 4cos30 | 12 |3 ° . 17.本题满分 7 分. 求不等式组 1 1 8 4 1. x x x x ≥ , 的整数解. 18.本题满分 8 分. 先化简,再求值: 2 2 2 4 4 4 1 x x x xx x x ,其中 3 2x . 参考答案 一、选择题:每小题 3 分,共 15 分.每小题给出四个答案,其中只有一个是正确的. 1.C 2.B 3.D 4.B 5.C 二、填空题:每小题 3 分,共 24 分. 6. a 7. 63.6 10 8.40 9.4(1 分),72(2 分) 10.小张 11. 1 2 12.50 13.7(1 分), 2 1n (2 分) 三、解答下列各题:本题有 10 小题,共 81 分.解答应写出文字说明、推理过程或演算步骤. 14.本题满分 7 分. (1)90········································································································· 2 分 (2)30········································································································· 4 分 4 3 ············································································································· 7 分 15.本题满分 7 分. (1)3···········································································································2 分 (2)1···········································································································4 分 (3)15········································································································· 7 分 16.本题满分 7 分. 解: 1 0 1( 3 2) 4cos30 | 12 |3 ° . 31 3 4 122 ····················································································· 4 分 4 2 3 2 3 ···························································································· 6 分 4 ·············································································································· 7 分 17.本题满分 7 分. 解:由 1 1x x ≥ 得 1x≥ ,···········································································2 分 由 8 4 1x x ,得 3x . ··········································································· 4 分 所以不等式组的解为:1 3x ≤ , ···································································6 分 所以不等式组的整数解为:1,2.······································································7 分 18.本题满分 8 分. 解: 2 2 2 4 4 4 1 x x x xx x x 2 ( 2)( 2) ( 1) ( 2) 1 x x x x xx x ···································· 3 分 2 12 x x 2 2 x x ·········································································································6 分 当 3 2x 时,原式 32 2 63 22 .······································································ 8 分查看更多