大家出几道 初一的数学题 偶们来解解

我来解 你来提 不要提太难的
2024-11-30 18:44:55
推荐回答(1个)
回答(1):

下面这个可以了吧?

初一下学期期中测试

班级: 姓名: 满分:100分 得分:

一、填空题(每小题2分,共30分)
1.单项式-x4y的系数是________,次数是________.
2.某商场的一种彩电标价为a元/台.“十一”到了,商场按八折的优惠价出售,商场销售b台彩电共得________元
3.若a<0,则7a+8|a|=________.
4.按要求填表
多项式 3x-2 -x+x2-10 xy2+x3-y2-x2y

常数项
次数
几次几项式
5.单项式-5ax2与-4x2a的差是________.
6.5m2-(________)-4=-2m2-5m+4
7.已知A=3a2+4ab- b2,B=5a2-2ab,且2A-B+C=0,则C=________
8.我国研制的“曙光3000超级服务器”的峰值计算速度达到403200000000次/秒:用科学记数法可表示为________次/秒.
9.x2-x+________=(x- )2
10.4张船票,3张飞机票,分别放在7个相同的盒子中,小丽从中任取一个盒子决定出游方式,则取到________票的可能性较大.
11.四张“K”牌和两张王牌,从中任意抽取一张,抽到红桃K的概率是________,抽到“K”牌的概率是________.
12.观察下列算式:1×3+1=4=22,2×4+1=9=32,3×5+1=16=42,4×6+1=25=52……你发现了什么规律,请用公式表示出来:________.
13.如图1,在△ABC中,AB=AC,DE是AB的垂直平分线,△BCE的周长为12,BC=5,则AB的长为________.

图1
14.如图2,AB、CD相交于O,OE平分∠BOD,若∠AOC=45°,则∠BOE=________.

图2
15.如图3,直线AB、CD相交于O,EO⊥AB于O,∠AOD=150°,则∠COE=________.

图3

二、选择题(每小题2分,共30分)
16.下列说法正确的是( )
A.x的次数是0
B.x的系数是0
C.-10是单项式
D.-10是一次单项式

A.2个 B.3个 C.4个 D.5个
18.下列各式中,是多项式的是( )
A.- x2y B.2x+3=0
C.S= (a+b)h D.-x2-3xy+1
19.若a、b为自然数,多项式xb+ya+2a+b的次数是( )
A.a B.b C.a+b D.a、b中较大的数
20.下列各式:①a5+a5=a10 ②a5-a3=a2 ③a+2a2=3a3 ④2x2-3x2=-1中,运算错误的有( )
A.1个 B.2个 C.3个 D.4个
21.如图4,AB‖CD,则=( )

图4
A.75° B.80° C.85° D.90°
22.一个角的平分线与这个角的邻补角的平分线组成的角是( )
A.平角 B.钝角 C.直角 D.锐角
23.二十一世纪,纳米技术将被广泛应用.纳米是长度计算单位,1纳米=0.000000001米,则5纳米的纤维长用科学记数法表示为( )
A.5×10-9米 B.5×10-7米 C.50×10-8米 D.5×10-8米
24.如图5,直线a、b被直线c所截,现给出四个条件:①∠1=∠5 ②∠1=∠7 ③∠2+∠3=180° ④∠4=∠7,其中能判定a‖b的条件的序号是( )

图5
A.①③ B.①② C.①④ D.③④
25.如图6,已知∠AOC=∠BOC=90°,∠1=∠2,则图中互为余角的共有( )

图6
A.2对 B.3对 C.4对 D.5对
26.已知x2-2mx+1是完全平方式,则m的值是( )
A.1 B.-1 C.±1 D.0
27.如图7,AB‖CD‖EF,EG‖DB,则图中与∠1相等的角(∠1除外)共有( )

图7
A.6个 B.5个 C.4个 D.3个
28.三角形的第一边长为(a+b),第二边长比第一边长长(a-5),第三边长为2b,那么这个三角形的周长为( )
A.3a+3b-5 B.3a+4b-5 C.3a+4b+5 D.3b+5
29.若a-2b=4,则5(2b-a)2-3(2b-a)-100的值为( )
A.-8 B.-32 C.-192 D.-168
30.一等奖红包2个,二等奖红包10个,三等奖红包15个,从中任取一个是一等奖的概率是( )
A. B

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