期中数学考试该注意些什么（初一上学期）

Question

有哪些重点题？拜托快点啊！明天我们就考了！（数学老师优先）
不要卷子！而且不要抄的卷子！

Answer 1

我觉得最应该注意的就是先检查一下小抄都全了吗？

Answer 2

一、选择题，你一定会选对！（每小题3分，共30分）
1、计算： 的值为 （ ）
A．5 B. -5 C. D.
2、以下列各组数据为边长，能构成三角形的是 （ ）
A. 3，4，5 B. 4，4，8 C. 3，10，4 D. 4，5，10
3、下列计算中正确的是 （ ）
A. B.
C. D.
4、下列各式能用平方差公式计算的是 （ ）
A． B．
C． D．
5、下列各组数中，是方程组 的解的是 （ ）
A、 B、 C、 D、
6、下列各式中，可以作为因式分解的最后结果的是 （ ）
A. a(x2＋y2)＋2axy B．(2m－n)[m－(2m－n)]
C．(x2＋y2＋xy)(x2＋y2－xy) D．a2(3－ )
7、如图，在下列给出的条件中，不能判定AB‖DF的是 （ ）
A.∠A+∠2=180° B.∠A=∠3
C.∠1=∠4 D.∠1=∠A
8、下列方程中① ② ③ ④
⑤ ，属于二元一次方程的个数为 （ ）
A．0个 B．1个 C．2个 D．3个
9、如图所示的图案分别是奔驰、奥迪、大众、三菱汽车的车标，其中，可以看作由“基
本图案”经过平移得到的是 （ ）

10、一个多边形的边数每增加一条，这个多边形的 （ ）
A．内角和增加3600 B．外角和增加3600
C．对角线增加一条 D．内角和增加1800
二、填空题，你能做得又快又准！（每小题2分，共18分）
11、若am＝2，an＝3，则am+2n =________。
12、 用科学计数法表示为 。
13、如果一个多边形的内角和是1440º，那么这个多边形的边数是 ，它的外角和是 。
14、如果 ,那么mn＝ 。
15、若H是△ABC三条高AD、BE、CF的交点，则△HBC中BC边上的高是 ，△BHA中BH边上的高是 。
16、若x2+mx+4是完全平方式，则m= 。
17、计算：（— ）2006×（—5）2007= 。
18、若（2a—1）0=1则a 。
19、如果 的乘积中不含 项,则 为 。
三、算一算，千万别出错！
21、计算：（每小题4分，共16分）
（1） （2）

（3） （4）

22、因式分解（每小题4分，共8分）
（1）x3—x （2）（x2—2x）2+2（x2—2x）+1

23、解方程组（每小题4分，共4分）

24、（5分）化简与求值：
，其中a= ，b＝－1 .

四、画图题，画出你的风采！（本题5分）
25、如图，先将方格中的图形沿着MN方向平移，平移的距离MN的长，画出平移后的新图形，再将平移后图形配上一句恰当的解说词。

五、解答题，做一做，肯定行！
26、如图，BD是△ABC的角平分线，DE‖BC，交AB于点E，∠A=45°，
∠BDC=60°，求∠BED的度数. （6′）

27、探究应用（共8分）
（1）计算：
①（a－2）（a2 + 2a + 4） ②（2x－y）（4x2 + 2xy + y2）

（2）上面的整式乘法计算结果很简洁，你能发现一个新的乘法公式：
（请用含a.b的字母表示）。
（3）下列各式能用你发现的乘法公式计算的是（ ）
A.（a－3）（a2－3a + 9） B.（2m－n）（2m2 + 2mn + n2）
C.（4－x）（16 + 4x + x2） D.（m－n）（m2 + 2mn + n2）
（4）直接用公式写出计算结果：
（3x － 2y）（9x2 + 6xy + 4y2）=
（2m－3）（4m2 + + 9）=

[参考答案]
一、选择题，你一定会选对！
题号 1 2 3 4 5 6 7 8 9 10
答案 C A D B C C D B B D
二、填空题，你能做得又快又准！
11、18 12、6.35×10—4 13、10 3600 14、12 15、HD AE 16、±4
17、—5 18、a≠ 19、
三、算一算，千万别出错！
21、计算：（1）—10 （2）—9a3 （3）2x2—x—1 (4)m2—n2+4n—4
22、因式分解
(1)x(x+1)(x—1) (2) (x—1)4
23、解方程组
24、先化简后求值 ab —1
四、画图题，画出你的风采！
25、 略
五、解答题，做一做，肯定行！
26、∠BED=1500
27、（1） ①a3—8 ②8x3-y3
(2) (a-b)(a2+ab+b2)=a3-b3
(3) C
(4) 27x3-8y3 6m 8m3-27

Answer 3

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Answer 4

你们是哪里的考试？联考？洪山区的？还是？

Answer 5

加我我好好和你说说