数学七年级下期中测试卷

最好是2008年的快点求你了!!!
2025-02-25 12:11:23
推荐回答(1个)
回答1:

一、 细心选一选(每小题3分,共30分)
1、对于下列式子①ab;② ;③ ;④ ;⑤ ,以下判断正确的是( )
A、①③是单项式 B、②是多项式
C、①⑤是整式 D、②④是多项式
2、如图,由∠1=∠2,则可得出( )
A、AD‖BC B、AB‖CD
C、AD‖BC且AB‖CD D、∠3=∠4
3、下列各式的计算中,正确的是( )
A 、 B、a4 +a5 =a9
C、 D、
4、对于四舍五入得到的近似数3.20×105,下列说法正确的是( )
A、有3个有效数字,精确到百分位 B、有6个有效数字,精确到个位
C、有2个有效数字,精确到万位 D、有3个有效数字,精确到千位
5、已知:如图AB‖CD,CE平分∠ACD,∠A=110°,则∠ECD等于( )
A、110° B、70° C、55° D、35°
6、如果x+y=-5,xy=3, 那么x2+y2 的值是( )
A、25 B、-25 C、19 D、-19
7、下列各题中的数,是准确数的是( )
A、初一年级有800名同学 B、月球离地球的距离为38万千米
C、小明同学身高148cm D、今天气温估计28℃
8、一幅扑克牌去掉大小王后,从中任抽一张是红桃的概率是( )
A、 B、 C、 D、
9、1纳米相当于1根头发丝直径的六万分之一。则利用科学记数法来表示,头发丝的半径是( )
A、6万纳米 B、6×104纳米 C、3×10-6米 D、3×10-5米
10、x16 可写成( )
A、x8 +x8 B 、x8 x2 C 、x8x8 D、 x4x4
二、专心填一填(每空格2分,共24分)
1.如图,在直线DE与∠O的两边相交,则∠O的同位角是 。
∠8的内错角是 。 ∠1的同旁内角是 。
2.单项式 的系数是
3.用科学记数法表示:① ,② .
4.女生两人,男生一人,站成一排,女生不相邻的概率是______________。若围成一圈,女生不相邻的概率是___________。
5.∠1与∠2互余,∠2与∠3互补,∠1=63°,那么∠3= 。
6.(-4a3+12a2b-6abc)÷(-4a2 ) = _____________________________。
7.三个连续偶数,如果中间一个数是t ,则它们的积为______________________.
8.22004×(-0.5)2004 =_________________。
三、认真算一算(1━4每题5分,第5题6分,共26分)
1、(2x+y)(x-y) 2、(a+b-3)(a+b+3)

3、 104 ×100 ÷10-2 4、

5、先化简再求值(6分)
,其中x = 10,y =

四、用心画一画(本题4分)
1、 如图:打台球时,小球由A点出发撞击到台球桌边CD的点O处,请用尺规作图的方法作出小球反弹后的运动方向(不写作法,但要保留作用痕迹)

五、耐心做一做(共16分)
1、(6分)一个小妹妹将10盒蔬菜的标签全部撕掉了。现在每一个盒子看上去都一样,但是她知道有三盒玉米、两盒菠菜、四盒豆角、一盒土豆,她随机地拿出一盒打开它。求(1)盒子里是玉米的概率是多少?(2)盒子里面是豆角的概率是多少?(3)盒子里不是菠菜的概率是多少?

2、(6分)一个长方形的周长是4a-8b-4c,它的长是a-2b-2c 。
(1)求它的宽是多少?(2)求它的面积是多少?

3、(4分)已知:如图∠1=∠2,当DE与FH有什么位置关系时,CD‖FG?并说明理由

六.附加题(10分,可计入总分,但总分不得超过100分)
A同学在计算3(42+1)(4+1)时,3写成4-1后,
得3(4+1)(42+1)=(4-1)(4+1)(42+1)=(42-1)(42+1)=162-1.
受此启发后,在求(2+1)(22+1)(24+1)(28+1)…(22048+1)的值时,将乘积式(2-1),
得(2+1)(22+1)(24+1)(28+1)…(22048+1)=(2-1)(2+1)(22+1)(24+1)(28+1)…
(22048+1)=(22-1)(22+1)(24+1)(28+1)…(22048+1)=(24―1)(24+1)(28+1)…(22048+1)=…=(22048―1)(22048+1)=24096-1.读上面的材料,回答下列问题:

(1) (1+ )(1+ )(1+ )(1+ )+ 的值是多少?

(2) 借用上面的方法,再逆用平方差公式计算:

(1- )(1- )(1- )(1- ).

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