[真题]初三数学中考化简求值专项练习题及答案解析
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
本文部分内容来自网络,本人不为其真实性负责,如有异议请及时联系,本人将予以删除
数学中考化简求值专项练习题
注意:此类要求的题目,如果没有化简,直接代入求值一分不得! 考点:①分式的加减乘除运算 ②因式分解 ③二次根式的简单计算
1.化简,求值:
11
1(1
1222+---÷-+-m m m m m m ), 其中m =3.
2.先化简,再求代数式22
21111
x x x x -+---的值,其中x=tan600-tan450
3.化简:x
x x x x x x x x 416
)44122(2222+-÷+----+, 其中22+=x
4.计算:332141
222+-+÷
⎪⎭
⎫ ⎝⎛---+a a a a a a a .
5.
6、先化简,再求值:13x -·32269122x x x x
x x x
-+----,其中x =-6.
7.先化简:再求值:⎝⎛⎭⎫1-1a -1÷a 2
-4a +4
a 2
-a ,其中a =2+ 2 .
8.先化简,再求值:a -1a +2·a 2+2a a 2-2a +1÷1
a 2-1,其中a 为整数且-3<a <2.
9.先化简,再求值:222211y xy x x
y x y x ++÷⎪⎪⎭
⎫ ⎝⎛++-,其中1=x ,2-=y .
10.先化简,再求值:22
22(2)42
x x x x x x -÷++-+,其中1
2x =.
11.先化简,再求值:
222
112
(
)2442x x x x x x
-÷--+-,其中2x =(tan45°-cos30°)
12.22221
(1)121
a a a a a a +-÷+---+.
13.先化简再求值:1
1
12421222-÷+--•+-a a a a a a ,其中a 满足20a a -=.
14.先化简:1
44)113(2++-÷+-+a a a a a ,并从0,1-,2中选一个合适的数作为a 的值代入求值。
15.先化简,再求值:)1
1(x -÷1
1222-+-x x x ,其中x =2
16.2222
2369x y x y y
x y x xy y x y
--÷-++++.
17.先化简,再求值:222
4441x x x x x x x --+÷-+-,其中3
2
x =.
18.(本题满分4分)当2x =-时,求221
11
x x x x ++++的值.
19..先化简,再把 x 取一个你最喜欢的数代入求值:2
)22444(22-÷+-++--x x
x x x x x
20.(本题满分6分)先化简,再选择一个你喜欢的数代入求值。2011a
a 2-2a+1÷(a+1
a 2-1+1)
21.(2011•湘潭)先化简,再求值:,其中
.
22.(2011•娄底)先化简:()÷
.再从1,2,3中选一个你认为合适的数作为a 的值代入求值.
23.(2011•衡阳)先化简,再求值.(x+1)2+x (x ﹣2).其中.
24.(2011•常德)先化简,再求值,(+
)÷
,其中x=2.
25.先将代数式1
1
)(2+⨯
+x x x 化简,再从-1,1两数中选取一个适当的数作为x 的值代入求值.
本文部分内容来自网络,本人不为其真实性负责,如有异议请及时联系,本人将予以删除
BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidub aidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaiduba diubadiuBaidubaidubaidubaidubadiubadiu