1.若2x3+3x2+mx+1为x+1的倍式,则m=
2.因式分解3a3b2c-6a2b2c2+9ab2c3=
3.因式分解xy+6-2x-3y=
4.因式分解x2(x-y)+y2(y-x)=
5.因式分解2x2-(a-2b)x-ab=
6.因式分解a4-9a2b2=
7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=
8.因式分解ab(x2-y2)+xy(a2-b2)=
9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=
10.因式分解a2-a-b2-b=
11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=
12.因式分解(a+3)2-6(a+3)=
13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=
14.若2×4×(32+1)×(34+1)×(38+1)×(316+1)=3n-1,求n= .
15.利用平方差公式,求标准分解式4891= .
16.2x+1是不是4x2+5x-1的因式?答:.
17.若6x2-7x+m是2x-3的倍式,则m=
18.x2+2x+1与x2-1的公因式为 .
19.若x+2是x2+kx-8的因式,求k= .
20.若4x2+8x+3是2x+1的倍式请因式分解4x2+8x+3= .
21.2x+1是4x2+8x+3的因式,请因式分解4x2+8x+3= .
22.(1)x+2 (2)x+4 (3)x+6 (4)x-6 (5)x2+2x3+24 上列何者x2-2x-24的因式 (全对才给分)
23.因式分解下列各式:
(1)abc+ab-4a= .
(2)16x2-81= .
(3)9x2-30x+25= .
(4)x2-7x-30= .
24.若x2+ax-12=(x+b)(x-2),其中a、b均为整数,则ab= .
25.请将适当的数填入空格中:x2-16x+ =(x- )2.
26.因式分解下列各式:
(1)xy-xz+x= ;(2)6(x+1)-y(x+1)=
(3)x2-5x-px+5p= ;(4)15x2-11x-14=
27.设7x2-19x-6=(7x+a)(bx-3),且a,b为整数,则2a+b=
28.利用乘法公式展开99982-4= .
29.计算(1.99)2-4×1.99+4之值为 .
30.若x2+ax-12可分解为(x+6)(x+b),且a,b为整数,则a+b= .
31.已知9x2-mx+25=(3x-n)2,且n为正整数,则m+n= .
32.若2x3+11x2+18x+9=(x+1)(ax+3)(x+b),则a-b= .
33.2992-3992=
34.填入适当的数使其能成为完全平方式4x2-20x+ .
35.因式分解x2-25= .
36.因式分解x2-20x+100= .
37.因式分解x2+4x+3= .
38.因式分解4x2-12x+5= .
39.因式分解下列各式:
(1)3ax2-6ax= .
(2)x(x+2)-x= .
(3)x2-4x-ax+4a= .
(4)25x2-49= .
(5)36x2-60x+25= .
(6)4x2+12x+9= .
(7)x2-9x+18= .
(8)2x2-5x-3= .
(9)12x2-50x+8= .
40.因式分解(x+2)(x-3)+(x+2)(x+4)= .
41.因式分解2ax2-3x+2ax-3= .
42.因式分解9x2-66x+121= .
43.因式分解8-2x2= .
44.因式分解x2-x+14 = .
45.因式分解9x2-30x+25= .
46.因式分解-20x2+9x+20= .
47.因式分解12x2-29x+15= .
48.因式分解36x2+39x+9= .
49.因式分解21x2-31x-22= .
50.因式分解9x4-35x2-4= .
51.因式分解(2x+1)(x+1)+(2x+1)(x-3)= .
52.因式分解2ax2-3x+2ax-3= .
53.因式分解x(y+2)-x-y-1= .
54.因式分解(x2-3x)+(x-3)2= .
55.因式分解9x2-66x+121= .
56.因式分解8-2x2= .
57.因式分解x4-1= .
58.因式分解x2+4x-xy-2y+4= .
59.因式分解4x2-12x+5= .
60.因式分解21x2-31x-22= .
61.因式分解4x2+4xy+y2-4x-2y-3= .
62.因式分解9x5-35x3-4x= .
63.因式分解下列各式:
(1)3x2-6x= .
(2)49x2-25= .
(3)6x2-13x+5= .
(4)x2+2-3x= .
(5)12x2-23x-24= .
(6)(x+6)(x-6)-(x-6)= .
(7)3(x+2)(x-5)-(x+2)(x-3)= .
(8)9x2+42x+49= .
64.9x2-30x+k可化为完全平方式(3x+a)2,则k= a= .
65.若x2+mx-15可分解为(x+n)(x-3),m、n皆为整数,则m= n= .
66.求下列各式的和或差或积或商.
(1)(6512 )2-(3412 )2= .
(2)(7913 )2+2×7913 ×23 +49 = .
(3)1998×0.48-798×0.48-798×0.52+1998×0.52= .
67.因式分解下列各式:
(1)(x+2)-2(x+2)2= .
(2)36x2+39x+9= .
(3)2x2+ax-6x-3a= .
(4)22x2-31x-21= .
68.利用平方差,和的平方或差的平方公式,填填看
(1)49x2-1=( +1)( -1)
(2)x2+26x+ =(x+ )2
(3)x2-20x+ =(x- )2
(4)25x2-49y2=(5x+ )(5x- )
(5) -66x+121=( -11)2
69.利用公式求下列各式的值
(1)求5992-4992= (2)求(7512 )2-(2412 )2=
(3)求392+39×22+112= (4)求172-34×5+52=
(5)若2x+5y=13 +7 ,x-4y=7 -13 求2x2-3xy-20y2=
70.因式分解3ax2-6ax= .
71.因式分解(x+1)x-5x= .
72.因式分解(2x+1)(x-3)-(2x+1)(x-5)=
73.因式分解xy+2x-5y-10=
74.因式分解x2y2-x2-y2-6xy+4= .