专练7
专练7
一、选择题（每小题4分，共24分）每小题只有一个答案是正确的，请在答题卡上相应题目的答题区域内作答，答对的得4分，答错、不答或答案超过一个的一律得0分.
1．计算3233?的结果是 （ ）
A ．35；
B ．36 ；
C ．37 ；
D ．38．
2．使分式2
2-x 有意义的x 的取值范围是（ ） A. 2≤x ； B. 2-≤x ； C. 2x ≠； D. 2x ≠-．
3．已知点A ( 2, 3 ), 则点A 在（ ）
A ．第一象限；
B ．第二象限；
C ．第三象限；
D ．第四象限．
4．下列事件中，是必然事件的为（ ）
A ．打开电视机，正在播放动画片；
B ．掷一枚均匀硬币，正面一定朝上；
C . 每周的星期日一定是晴天；
D ．我县夏季的平均气温比冬季的平均气温高
5．已知⊙O 1和⊙O 2的半径分别为5和2，O 1O 2＝7，则⊙O 1和⊙O 2的位置关系是（ ）
A ．外离 ；
B ．外切 ；
C . 相交 ；
D ．内含 ．
6．如图，□ABCD 中，E 为AD 的中点．
已知△DEF 的面积为S ，则△DCF 的面积为（ ）
A ．S ；
B ．2S ；
C ．3S ；
D ．4S ．
二、填空题（每小题3分，共36分）在答题卡上相应题目的答题区域内作答.
7．－3的相反数是 ．
8．分解因式：x x 22- = ．
9．国家游泳中心“水立方”是北京2008年奥运会场馆之一，它的外层膜的展开面积
约为260 000平方米，用科学记数法表示是 平方米．
10．四边形的外角和等于 度．
11．小林同学7次上学途中所花时间（单位：分钟）分别为10，9，11，12，9，10，9．
这组数的众数为 ．
12．只用同一种正多边形铺满地面，请你写出一种这样的正多边形： ．
13．方程3
121+=x x 的解为=x ______． 14．反比例函数x
k y =的图象经过点（1，6） ，则k 等于______． 15．将抛物线2x y =向左平移4个单位后，再向下平移2个单
位，则所得到的
抛物线的函数关系式为_____________________ ．
16．如图，将半径为cm 2的圆形纸片折叠后，圆弧恰好经过 圆心O ，则折痕AB 的长为 cm .
17．已知圆锥的底面半径是2cm ，母线长是4cm ，则圆锥的侧面积是 cm 2.
18．按一定的规律排列的一列数依次为：-2，5，-10，17，-26，…按此规律
排下去，这列数中的第9个数是 ．
三、解答题
19．（8分）计算：│－4│+20080－23
20．（8分）先化简下面的代数式，再求值：
2)2(4-+a a ，其中5=a ．
21．（8分）已知：如图，∠A ＝∠DCF ，F 是AC 的中点．求证：△AEF ≌△CDF ．
二轮复习方略：专题二+阅读七选五专练(一)+Word版含解析
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