初二数学测试题大全Word格式文档下载.docx
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(x+2)(x-3)(x2-7)+(2+x)(3-x)(x+3)=(x+2)(x-3)(x2+x-4)(
30.10ab-3+6b-5a=(5a+3)(2b-1)(
31.873-763是11的倍数(
)
32.(m-n)2-2(m2-n2)+(m+n)2=2n2(
33.
2-2a4=2(1+a2)(1+a)(1-a)(
34.
35.m2-n2-m+n=(m-n)(m+n-1)(
36.
37.x3-2x2y+xy2=x(x-y)2(
38.当x=-3时,
39.
40.x2-2xy+y2-1=(x-y+1)(x-y-1)(
41.将a2-b2+2b-1分解因式得(a+b-1)(a-b+1)(
42.12x5-24x3+18x2=6x2(2x3-4x+3)(
43.
44.
45.
46.25x2y4z16-1=(5xy2z4-1)(5xy2z4+1)(
47.
x2(x+1)-y(xy+x)=x(x-y)(x+y+1)(
48.-am-1+14am-49am+1
=-am-1(1-7a)2
49.ab(x2+1)+x(a2+b2)=(a+bx)(b+ax)(
50.
a4-3a3+3a2-a=a(a-1)3(
51.1-x6=(1-x3)(1+x3)=(1-x)(1+x)(1-x+x2)(1+x+x2)(
52.a9-ab2=a(a4+b)(a4-b)(
53.
x3m+3-64y3=(xm+1-4y)(x2m+2+4xm+1y+16y2)(
54.
am-1-am+2+am-am+1=am-1(1+a)2(1-a)(
55.a2(a+1)-b2(b+1)=(a-b)(a2+ab+b2+a+b)(
56.
57.
(x+1)2+x(3x+2)=(2x+1)2
58.
5x2m+3y4n+2-10x3m+7y2n+1=5x2m+3y2n+1·
(y2n+1+2xm+4)(
59.a2n+an+1-an=an(an+a-1)(
60.
61.
8m3(m2-n2)-27n6(n2-m2)=(m2-n2)(2m+3n2)(4m2-6mn2+9n4)(
62.
8a3(x3-y6)+(y6-x3)=(x-y2)(x2+xy2+y4)(2a-1)(4a2+2a+1)(
63.
a8-81b8=(a4-9b4)(a4+9b4)(
64.
a16-b16=(a-b)(a+b)(a2+b2)(a4+b4)(a8+b8)(
65.
a4-4a3+4a2-9=(a2-2a-3)(a2-2a+3)(
66.
67.
a2-b2+m2-n2+2(am-bn)=(a+m+b
+n
)(a+m-b
-n
)(
68.ab(c2-d2)-cd(a2-b2)=(ac+bd)(bc-ad)(
69.
1+12x2y2+48x4y4+64x6y6=(1+4x2y2)3(
70.
x5+x4y+2x3y2+2x2y3+xy4+y5=(x+y)(x2+y2)2
71.
-am+1y2n-1+am-1y2n+1=am-1y2n-1(-a2+y2)(
72.2(a2-3mn)+a(4m-3n)=(a+2m)(2a-3n)(
73.
74.(a+b+c)3-(a3+b3+c3)=3(a+b)(b+c)(a+c)(
75.a3m-a3m+3=a3m(1-a)(1+a+a2)(
76.343m6-125n12=(7m2-5n4)(49m4+35m2n4+25n8)(
77.1+x+x(x+1)+x(x+1)2+x(x+1)3=(1+x)4(
78.am+4-8am+3-16am+2=am+2(a2-8a-16)(
79.
x3-x2-x-y3+y2+y=(x-y)(x2+xy+y2-x-y-1)(
80.(x+y)3+2xy(1-x-y)-1=(x+y-1)(x2+y2+x+y+1)(
81.
-12a2m+1bm+2+20am+1b2m+4=-4am+1bm+2(3am-5bm+2)(
82.
am+3-amb3=am(a-b)(a2+ab+b2)(
83.(a-b)n+3-(a-b)n=(a-b)n(a-b-1)(a2+b2-2ab+a-b+1)(
二、单选题。
84.
的结果是[
]A.a+5
B.
C.a2-1
D.a2-a+1
85.
4xy+2y-8x-y2的结果是[
]A.(4y+x)(y-2)B.(4x-y)(y
-2)C.(4x+y)(y+2)D.(4x+y)(y
-2)
86.当x=____时,
分式
没有意义.[
]A.x=3
B.x=-3
C.x=±
3
D.x=4
87.
等于[
]A.
C.
D.
88.
[
]A.-
D.-
89.4a2-b2+c2-4ac等于[]
A.(2a-c+b)(2a+c-b)B.(2a-c+b)(2a-c-b)C.(2a+c+b)(2a-c-b)D.(2a+c-b)(2a-c-b)
90.若代数式
有意义,
则x的取值范围是[
]
A.x≠1,
x≠-
2
B.x≠1,
x≠2C.x≠1,
x≠-2,
x≠2
D.x≠1,
x≠2,
x≠-1
91.
a2-2ab+b2-c2等于[
]A.(a-b+c)(a-b-c)
104.下列等式中,正确的是:
[]A.
B.
=-1C.
D.
105.下列等式中正确的是[]
A.
C.
106.
=[
]A.x-1
B.-x+1
C.-x-1
D.x+1
107.
÷
ax的结果是[
]A.
108.
的结果是[
]A.
-2
B.
C.
-1
D.
1
109.
B.-
110.3x2-3y2等于[
]A.(x-y)(x+y)
B.3(x-y)(x+y)C.3(x-y)2
D.3(x2-y2)
111.
B.-
C.-
112.
5a2-7a-5ab+7b等于[
]A.(a-b)(5a-7)
B.(a+b)(5a-7)C.(a+b)(5a+7)
D.(a-b)(5a+7)
113.a2-b2+4b-4等于[
]A.(a+b-2)(a-b+2)B.(a-b-2)(a-b+2)C.(a+b+2)(a-b+2)D.(a+b-2)(a+b-2)
114.
-a-5
-a+5
a-5
a+5
115.下列各式中,
正确的是[
]
=a+b
116.a2b+a2-4b-4等于[
]A.(b+1)(a+2)B.(b+1)(a-2)C.(b+1)(a+2)(a-2)D.(b+1)(a2-4)
117.如果分式
的值为零,
那么x的值为[
]A.30
B.0
C.1
D.2
118.-7ab+21abx-28aby等于[
]A.-7(ab+3x+4y)B.-7ab(1-3x+4y)C.-7ab(4y-3x)D.7ab(1-3x+4y)
119.若1<x<2,
则分式
的值为[
1
2
120.
121.
x3+x-y-y3等于[
]A.(x+y)(x2-xy+y2+1)B.(x-y)(x2+xy+y2+1)C.(x2+xy+y2)(x-y)D.(x2-xy+y2+x)
122.
123.
[
C.-
124.
0
125.
126.下列因式分解,完全正确的是[
]
A.
B.
C.
D.
127.多项式2a2+2ab+
b2分解因式的结果是[
]A.2(a+b)2B.
(2a+b)2C.(2a+b)2D.
128.分式
的值为零时,
x的值是[
]A.2
B.-1
C.2,
D.3,
-1
129.已知x为非零实数,那么
的值是[
]A.-1或3B.1或3C.-1或-3D.1或-3
130.
m2n-mn2-3m+3n等于[
]A.(m-n)(mn-3)B.(m+n)(mn-3)C.(m+n)(mn+3)D.(m-n)(mn+3)
131.25x2-9y2等于[
]A.(5x+3y)(5x-y)
B.(5x-3y)2C.(5x+3y)(5x-3y)
D.(25x+9y)(x-y)
132.
=等于[
]A.-
133.计算
=[
-
134.
1-n4等于[
]A.(1+n2)(1-n)2B.(1+n2)(1+n)(1-n)C.(1+n)2(n-1)(1-n)
D.(1+n2)(n-1)(1+n)
135.当-3<
x<
4时,
化简分式
C.-1
D.-2
136.分式
中的x和y都扩大2倍,
那么分式的值[
]A.扩大两倍
B.不变
C.扩大四倍
D.缩小两倍
137.已知
138.在分式
中,
当a=________时分式无意义.[
]A.0
B.2
C.-2
D.1
139.a3+a2-2ab+b2-b3等于[]
A.(a+b)(a2+ab+b2+a-b)B.(a-b)(a2-ab+b2+a-b)C.(a-b)(a2+ab+b2+a-b)D.(a-b)(a2-ab-b2-a+b)
140.在有理数范围内,4x-x5等于[
]A.x(2+x2)(2-x2)
B.x(2-x)2
C.x(2+x2)2
D.x(2+x2)
141.
8x2y2-16xy+8等于[
]A.(xy-1)2
B.(xy+1)2
C.8(xy-1)2
D.8(xy+1)2
142.
x2y-x2z+y2z-y3等于[
]A.(y-z)(x2-y2)
B.(y-z)(x-y)(x+y)C.(y-z)2(x-y)
D.(y-z)(x+y)2
143.
2x3+16等于[
]A.(x+2)(x2-2x+4)B.2(x+2)(x2+2x+4)C.2(x+2)(x2-2x+4)D.2(x+2)(x2-2x-4)
144.
x2-y2+3x+3y等于[
]A.(x+y)(x+y-3)
B.(x-y)(x+y+3)C.(x+y)(x-y-3)
D.(x+y)(x-y+3)
145.
A.
146.
x2-4y2+x+2y等于[
]A.(x+2y)(x-2y+1)B.(x-2y)(x-2y+1)C.(x+2y)(x+2y+1)D.(x+2y)(x-2y-1)
147.
]
148.x2+y2-z2+2xy等于[
]A.(x+y+z)(x+y-z)B.(x-y-z)(x+y+z)C.(x-y-z)(x+y-z)D.(x-y+z)(x+y-z)
149.
]A.
150.
(a+2b)2-(x-3y)2等于[
A.(a-2b-x+3y)(a-2b-x-3y)B.(a+2b-x-3y)(a+2b-x-3y)
C.(a+2b+x-3y)(a+2b-x+3y)D.(a-2b+x-3y)(a-2b-x+3y)
151.a3-b3的结果是:
A.a3-b3=(a-b)(a2+2ab+b2)B.a3-b3=(a-b)(a2-2ab+b2)C.a3-b3=(a-b)(a2-ab+b2)D.a3-b3=(a-b)(a2+ab+b2)
152.
8x6+x3等于[
A.x3(2x+1)(4x2-2x+1)B.x3(2x-1)(4x2-2x+1)C.x3(2x+1)(4x2+2x+1)D.x3(2x+1)(4x2+2x-1)
153.下列分式中,
与分式
的值相等的是[]
154.已知x=3y,
则
]A.
155.a3-ab2+a-b等于[]A.(a-b)(a2+ab+1)B.(a-b)(a2-ab+1)C.(a+b)(a2+ab+1)D.(a+b)(a2+ab-1)
156.
a2-20a+100等于[
]A.(a+10)2
B.(a-1)2C.(a-10)
D.(a-10)2
157.若分式
的值等于零,
则x的值为[
]A.1
B.±
D.-1
158.
159.把分式
中的x和y都扩大3倍,那么分式的值[]
A.扩大了3倍B.不变C.缩小了3倍D.扩大了9倍
160.分式
恒等于[
C.
161.
x2-y2+2x+1等于[
]A.(x+y+1)(x-y+1)B.(x-y+1)(x-y-1)C.(x+y-1)(x-y-1)D.(x+y-1)(x-y+1)
162.
163.
x-4
x-5
x-6
x-7
164.下列各恒等变形中,
是因式分解的是:
A.a2-2ab+b2=(a-b)2B.(a+b)2=a2+2ab+b2C.a2b+ab2+c=ab(a+b)+cD.a2-2ab+b2-c=(a-b)2-c
165.4xy+1-4x2-y2等于[
A.(1+2x-y)(1-2x+y)B.(1+2x+y)(1+2x-y)C.(1-2x-y)(1+2x+y)D.(4-2x+y)(2-3x-y)
166.
的值=[
167.
-xy等于[
168.计算
B.
169.16x2+56xy+49y2等于[
]A.(4x-7y)2
B.(4x+7y)2
C.(4x+y)2
D.(x+7y)2
170.4-4a2+8ab-4b2分解因式的结果是[
A.4(1-a+b)(1+a-b)
B.(2-2a+2b)(2+2a+2b)C.(2-2a+2b)(2+2a-2b)
D.4〔1-(a-b)2〕
171.(x-3)(3x-2)-7(x-3)的结果是[
3(x-3)(x-3)B.
(x-3)(3x-9)C.
3(x-3)2D.
3(x-3)
172.
173.
174.当x=_____时,
]A.-4
C.4
175.多项式a2-36b2分解因式的结果是:
A.(a2-6b)(a2+6b)
B.(a+6b2)(a-6b2)C.(a+6b)(a-6b)
D.(a+36b)(a-36b)
176.下列因式分解正确的是[
B.
D.
177.x3-xy2
因式分解的结果是[
]A.x(x2-y2)
B.x(x-y)2
C.-x(x2+y2)
D.x(x-y)(x+y)
178.分解因式a2b2-b4等于:
]A.b2(a+b)(b-a)
B.b2(a-b)2C.b2(a+b)(a-b)
D.b2(a+b)2
179.xn-ym分解因式为(x-y)(x2+xy+y2),那么m、n的值是[
A.m=3,n=3B.m=2,n=2C.m=3,n=2D.m=4,n=4
180.使分式
的值为正的条件是[
]A.x<
B.x>
C.x<
D.x>
0
181.多项式m(a-2)+(2-a)分解因式的结果是[
]A.(a-2)(m+1)B.(a-2)(m-1)C.(2-a)(m+1)D.(2-a)(m-1)
182.
-a3
-a4
-a5
-a6
183.18x3nym+27xny2m的公因式是[
]A.3xnym
B.9xnymC.3xnym+1
D.9xny2m
184.x2y2+x2y-4xy-2x+4等于[
A.(xy-2)(y+x+2)
B.(xy+2)(xy+x-2)C.(xy-2)(xy+x-2)
D.(xy-2)(xy-x+2)
185.在有理数范围内a8-81b8等于[
A.(a2-3b2)2(a2+3b2)2B.(a4-9b4)(a4+9b4)
C.(a4+9b4)(a2-3b2)(a2+3b2)D.(a4-9b4)2
186.
]A.a
B.-a
C.a2
D.2a
187.
4
188.将多项式16x8-1在有理数范围内分解因式,
正确的结果是:
A.(4x4+1)(4x4-1)B.(4x4+1)(2x2+1)(2x2-1)C.(2x2+1)2(2x2-1)2D.(2x2+2x+1)(2x2-2x+1)(2x2+1)(2x2-1)
189.多项式
am-1-am+2+am+am+1的公因式是:
]A.am
B.am-1
C.am+1
D.am+2
190.
2x3n-12x2ny2+18xny4等于[
]A.2xn(xn-3y2)2
B.2xn(xn-3y2)C.xn(2xn-6y2)2
D.2x(xn-3y2)2