最新初中数学总复习:《整式的乘除》基础练习题
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初中数学总复习:《整式的乘除》基础练习题 1
(一)填空题(每小题2分,共计20分)
2 1.x 10=(-x 3)2·_________=x 12÷x (
3 2.4(m -n )3÷(n -m )2=___________.
4 3.-x 2·(-x )3·(-x )2=__________.
5 4.(2a -b )()=b 2-4a 2.
6 5.(a -b )2=(a +b )2+_____________. 7
6.(31)-2+0=_________;4101×0.2599=__________.
8 7.2032×193
1=( )·( )=___________. 9 8.用科学记数法表示-0.0000308=___________.
10 9.(x -2y +1)(x -2y -1)2=( )2-( )2=_______________. 11
12
10.若(x +5)(x -7)=x 2+mx +n ,则m =__________,n =________. 13 (二)选择题(每小题2分,共计16分)
14 11.下列计算中正确的15
是…………………………………………………………………( )
16 (A )a n ·a 2=a 2n (B )(a 3)2=a 5 (C )x 4·x 3·x =x 7 (D )a 2n -3÷a 3-n =a 3n -6
17
18
12.x 2m +1可写作 (19)
( )
20 (A )(x 2)m +1 (B )(x m )2+1 (C )x ·x 2m (D )(x m )m +1.
21 13.下列运算正确的是 (22)
( )
23 (A )(-2ab )·(-3ab )3=-54a 4b 4
24 (B )5x 2·(3x 3)2=15x 12
25 (C )(-0.16)·(-10b 2)3=-b 7
26 (D )(2×10n )(
21×10n )=102n 27 14.化简(a n b m )n ,结果正确的是 (28)
( )
29 (A )a 2n b mn (B )n m n b a 2 (C )mn n b a 2 (D )n
m n b a 2 30 15.若a ≠b ,下列各式中不能成立的是 (31)
( )
32 (A )(a +b )2=(-a -b )2 (B )(a +b )(a -b )=(b +a )(b -a ) 33 (C )(a -b )2n =(b -a )2n (D )(a -b )3=(b -a )3
34 16.下列各组数中
,互为相反数的35
是……………………………………………………( )
36 (A )(-2)-3与23 (B )(-2)-2与2-2
37 (C )-33与(-31)3 (D )(-3)-3与(31)3 38
17.下列各式中正确的39
是………………………………………………………………( )
40 (A )(a +4)(a -4)=a 2-4 (B )(5x -1)(1-5x )=25x 2-1 41 (C )(-3x +2)2=4-12x +9x 2 (D )(x -3)(x -9)=x 2-27 42
43
18.如果x 2-kx -ab =(x -a )(x +b ),则k 应为 (44)
( )
45 (A )a +b (B )a -b (C )b -a (D )-a -b 46
47
(三)计算(每题4分,共24分)
48 19.(1)(-3xy 2)3·(61x 3y )2; 49
50
51
52
53
(2)4a 2x 2·(-52a 4x 3y 3)÷(-2
1a 5xy 2); 54
55
56
57
58
59
60
(3)(2a-3b)2(2a+3b)2;
61
62
63
64
65
66
67
68
(4)(2x+5y)(2x-5y)(-4x2-25y2);
69
70
71
72
73
74
75
(5)(20a n-2b n-14a n-1b n+1+8a2n b)÷(-2a n-3b);(6)(x-3)(2x+1)-3(2x -1)2.
76
77
78
79
80
81
82
83
84
20.用简便方法计算:(每小题3分,共9分)
(1)982;
85
86
87
88
89
90
(2)899×901+1;
91
92
93
94
(3)(7
10)2002·(0.49)1000. 95
96
97
98
99
(四)解答题(每题6分,共24分) 100 21.已知a 2+6a +b 2-10b +34=0,求代数式(2a +b )(3a -2b )+4ab 的值. 101
102
103
104
105
106
107 22.已知a +b =5,ab =7,求22
2b a ,a 2-ab +b 2的值. 108
109
110
111
112
113
23.已知(a +b )2=10,(a -b )2=2,求a 2+b 2
,ab 的值. 114
115
116
117
118
119
120
121