您现在的位置是:爱问

初一因式分解练习题及答案

2021-04-12 01:10爱问

简介1 初一因式分解练习题及答案 你可真狠 要这么多题目 1. 5ax+5bx+3ay+3by 解法:=5x(a+b)+3y(a+b) =(5x+3y)(a+b) 2. x^3-x^2+x-1 解法:=(x^3-x^2)+(x-1) =x^2(x-1)+ (x-1) =(x-1)(x^2+1) 3. x2-x-y2-y 解法:=(x2-y2)-(x+y) =(x+y)(x-y)-(x+y) =(x+y)(x-y-1)...

1

初一因式分解练习题及答案


你可真狠 要这么多题目

1. 5ax+5bx+3ay+3by

解法:=5x(a+b)+3y(a+b)

=(5x+3y)(a+b)

2. x^3-x^2+x-1

解法:=(x^3-x^2)+(x-1)

=x^2(x-1)+ (x-1)

=(x-1)(x^2+1)

3. x2-x-y2-y

解法:=(x2-y2)-(x+y)

=(x+y)(x-y)-(x+y)

=(x+y)(x-y-1)

bc(b+c)+ca(c-a)-ab(a+b)

=bc(c-a+a+b)+ca(c-a)-ab(a+b)

=bc(c-a)+bc(a+b)+ca(c-a)-ab(a+b)

=bc(c-a)+ca(c-a)+bc(a+b)-ab(a+b)

=(bc+ca)(c-a)+(bc-ab)(a+b)

=c(c-a)(b+a)+b(a+b)(c-a)

=(c+b)(c-a)(a+b).

x^2+3x-40

=x^2+3x+2.25-42.25

=(x+1.5)^2-(6.5)^2

=(x+8)(x-5).

(x^2+x+1)(x^2+x+2)-12时,可以令y=x^2+x,则

原式=(y+1)(y+2)-12

=y^2+3y+2-12=y^2+3y-10

=(y+5)(y-2)

=(x^2+x+5)(x^2+x-2)

=(x^2+x+5)(x+2)(x-1).

(1+y)^2-2x^2(1+y^2)+x^4(1-y)^2

解:原式=(1+y)^2+2(1+y)x^2(1+y)+x^4(1-y)^2-2(1+y)x^2(1-y)-2x^2(1+y^2)

=[(1+y)+x^2(1-y)]^2-2(1+y)x^2(1-y)-2x^2(1+y^2)

=[(1+y)+x^2(1-y)]^2-(2x)^2

=[(1+y)+x^2(1-y)+2x]·[(1+y)+x^2(1-y)-2x]

=(x^2-x^2y+2x+y+1)(x^2-x^2y-2x+y+1)

=[(x+1)^2-y(x^2-1)][(x-1)^2-y(x^2-1)]

=(x+1)(x+1-xy+y)(x-1)(x-1-xy-y)

x^5+3x^4y-5x^3y^2+4xy^4+12y^5

解:原式=(x^5+3x^4y)-(5x^3y^2+15x^2y^3)+(4xy^4+12y^5)

=x^4(x+3y)-5x^2y^2(x+3y)+4y^4(x+3y)

=(x+3y)(x^4-5x^2y^2+4y^4)

=(x+3y)(x^2-4y^2)(x^2-y^2)

=(x+3y)(x+y)(x-y)(x+2y)(x-2y)

分解因式m +5n-mn-5m

解:m +5n-mn-5m= m -5m -mn+5n

= (m -5m )+(-mn+5n)

=m(m-5)-n(m-5)

=(m-5)(m-n)

分解因式bc(b+c)+ca(c-a)-ab(a+b)

解:bc(b+c)+ca(c-a)-ab(a+b)=bc(c-a+a+b)+ca(c-a)-ab(a+b)

=bc(c-a)+ca(c-a)+bc(a+b)-ab(a+b)

=c(c-a)(b+a)+b(a+b)(c-a)

=(c+b)(c-a)(a+b)

1.(2a-b)²+8ab

2.y²-2y-x²+1

3.x²-xy+yz-xz

4.6x²+5x-4

5.2a²-7ab+6b²

6.(x²-2x)²+2(x²-2x)+1

7.(x²-2x)²-14(x²-2x)-15

8.x²(x-y)+(y-x)

9.169(a+b)²-121(a-b)²

10.(x-3)(x-5)+1

答案:1.(2a-b)²+8ab=(2a+b)²

2.y²-2y-x²+1=(y-1)²-x²=(y-1-x)(y-1+x)

3.x²-xy+yz-xz =x(x-y)-z(x-y)=(x-z)(x-y)

4.6x²+5x-4 =(2x-1)(3x+4)

5.2a²-7ab+6b²=(2a-3b)(a-2b)

6.(x²-2x)²+2(x²-2x)+1 =(x²-2x+1)²=(x-1)^4

7.(x²-2x)²-14(x²-2x)-15 =(x²-2x-15)(x²-2x+1)=(x+3)(x-5)(x-1)²

8.x²(x-y)+(y-x) =(x²-1)(x-y)=(x+1)(x-1)(x-y)

9.169(a+b)²-121(a-b)²

=(14a+14b-11a+11b)(14a+14b+11a-11b)

=(3a+25b)(25a+3b)

10.(x-3)(x-5)+1 =(x-3)²-2(x-3)+1 =(x-3-1)²=(x-4)²

-5a^2+16a=a(16-5a)

8x^2-4x=4x(2x-1)

15p+10p^2=5p(3+2p)

-3x^2y-6xy=-3xy(x+2y)

14m^3n^2-6m^2n^3=2m^2n^2(7m-6n)

27a^2 b^3 c+18ab^2=9ab^2(3abc+2)

18xy^2 z^3+12x^2 y^2=6xy^2(3z^3+2x)

8m^2 n^2 -6m^3 n^2=2m^2 n^2(4-3m)

因式分解3a3b2c-6a2b2c2+9ab2c3=3ab^2 c(a^2-2ac+3c^2)

3.因式分解xy+6-2x-3y=(x-3)(y-2)

4.因式分解x2(x-y)+y2(y-x)=(x+y)(x-y)^2

5.因式分解2x2-(a-2b)x-ab=(2x-a)(x+b)

6.因式分解a4-9a2b2=a^2(a+3b)(a-3b)

7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=(x-1)(x+2)^2

8.因式分解ab(x2-y2)+xy(a2-b2)=(ay+bx)(ax-by)

9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=2y(a-b-c)

10.因式分解a2-a-b2-b=(a+b)(a-b-1)

11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^2

12.因式分解(a+3)2-6(a+3)=(a+3)(a-3)

13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2) abc+ab-4a=a(bc+b-4)

(2)16x2-81=(4x+9)(4x-9)

(3)9x2-30x+25=(3x-5)^2

(4)x2-7x-30=(x-10)(x+3)

35.因式分解x2-25=(x+5)(x-5)

36.因式分解x2-20x+100=(x-10)^2

37.因式分解x2+4x+3=(x+1)(x+3)

38.因式分解4x2-12x+5=(2x-1)(2x-5)

39.因式分解下列各式: (1)3ax2-6ax=3ax(x-2) (2)x(x+2)-x=x(x+1) (3)x2-4x-ax+4a=(x-4)(x-a) (4)25x2-49=(5x-9)(5x+9) (5)36x2-60x+25=(6x-5)^2 (6)4x2+12x+9=(2x+3)^2 (7)x2-9x+18=(x-3)(x-6) (8)2x2-5x-3=(x-3)(2x+1) (9)12x2-50x+8=2(6x-1)(x-4)

40.因式分解(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-1)

41.因式分解2ax2-3x+2ax-3= (x+1)(2ax-3)

42.因式分解9x2-66x+121=(3x-11)^2

43.因式分解8-2x2=2(2+x)(2-x)

44.因式分解x2-x+14 =整数内无法分解

45.因式分解9x2-30x+25=(3x-5)^2

46.因式分解-20x2+9x+20=(-4x+5)(5x+4)

47.因式分解12x2-29x+15=(4x-3)(3x-5)

48.因式分解36x2+39x+9=3(3x+1)(4x+3)

49.因式分解21x2-31x-22=(21x+11)(x-2)

50.因式分解9x4-35x2-4=(9x^2+1)(x+2)(x-2)

51.因式分解(2x+1)(x+1)+(2x+1)(x-3)=2(x-1)(2x+1)

52.因式分解2ax2-3x+2ax-3=(x+1)(2ax-3)

53.因式分解x(y+2)-x-y-1=(x-1)(y+1)

54.因式分解(x2-3x)+(x-3)2=(x-3)(2x-3)

55.因式分解9x2-66x+121=(3x-11)^2

56.因式分解8-2x2=2(2-x)(2+x)

57.因式分解x4-1=(x-1)(x+1)(x^2+1)

58.因式分解x2+4x-xy-2y+4=(x+2)(x-y+2)

59.因式分解4x2-12x+5=(2x-1)(2x-5)

60.因式分解21x2-31x-22=(21x+11)(x-2)

61.因式分解4x2+4xy+y2-4x-2y-3=(2x+y-3)(2x+y+1)

62.因式分解9x5-35x3-4x=x(9x^2+1)(x+2)(x-2)
2

3

初一因式分解练习题+复杂的


这里有很多

任意下载,Word版,很不错的百度文库。

http://wenku.baidu.com/search?word=%D2%F2%CA%BD%B7%D6%BD%E2&lm=0&od=0
4

初一因式分解练习题300道


(1)a的四次方+a²+1

=a^4+2a²+1-a²

=(a²+1)²-a²

=(a²+a+1)(a²-a+1)

(2)2a²-7ab+6b²

=(2a-3b)(a-2b)

(3)3x²+xy-2y²

=(3x-2y)(x+y)

(4)10a²b²+11ab-6

=(2ab+3)(5ab-2)

(5)7a³x-28a(x的五次方)

=7a³(x-4a²)

(6)x³-10x²+16x

=x(x²-10x+16)

=x(x-2)(x-8)

(7)(x²+3x)²-2(x²+3x)-8

=(x²+3x+2)(x²+3x-4)

=(x+1)(x+2)(x+4)(x-1)

(8)(x-y)²+4xy-1

=x²-2xy+y²+4xy-1

=x²+2xy+y²-1

=(x+y)²-1

=(x+y+1)(x+y-1)

9.x^2 -4xy +4y^2 -x +2y -2

= (x-2y)^2 - (x-2y) -2

=(x-2y + 1)(x-2y-2)

10.x³+ax²+bx²+cx²+abx+bcx+acx+ab

=x³+cx²+abx+abc+bx²+bcx+ax²+acx

=x²(x+c)+ab(x+c)+bx(x+c)+ax(x+c)

=(x+c)[x²+bx+ab+ax]

=(x+c)[x(x+b)+a(x+b)]

=(x+a)(x+b)(x+c)

11.x²-y²-y-1/2

=x²-(y²+y+1/4)

=x²-(y+1/2)²

=(x+y+1/2)(x-y-1/2)

12.x的四次方+3x³+6x ² -4

=x^4+x³+2x³+2x²+4(x²-1)

=x³(x+1)+2x²(x+1)+(4x-4)(x+1)

=(x+1)(x³+2x²+4x-4)

13.x³-3x²+4

=x³+1-3(x²-1)

=(x+1)(x²-x+1)-(3x-3)(x+1)

=(x+1)(x²-4x+4)

=(x+1)(x-2)²

14.32a[(x^2+2x)^2]-2a

=2a[16(x^2+2x)^2-1]

=2a(4x^2+8x+1)(4x^2+8x-1)

15.16+8(x^2+4x)+(x^2+4x)^2

=(4+x^2+4x)^2

=(x^2+4x+4)^2

=(x+2)^4

16.3x^ny+9x^(n-1)y^2+x^(n+1)/4

=x^(n-1)(3xy+9y^2+x^2/4)

=x^(n-1)(x^2/4+3xy+9y^2)

=x^(n-1)(x/2+3y)^2

=(1/4)[x^(n-1)](x+6y)^2

17.a^4+a³+3a-5

=a²*(a²+a)+3a-5

=3a²+3a-5

=3(a²+a)-5

18.1+x+x(x+1)+x(x+1)^2+x(x+1)^3

=(1+x)+x(x+1)+x(x+1)^2+x(x+1)^3

=(1+x)(1+x)+x(x+1)^2+x(x+1)^3

=(1+x)²(1+x)+x(x+1)^3

=(1+x)³(1+x)

=(1+x)^4

19. (x-y)(2x-2y-3)-2

=(x-y)[2(x-y)-3]-2

=2(x-y) ^2-3(x-y)-2

=[(x-y)-2][2(x-y)+1]

=(x-y-2)(2x-2y+1).

x2-3xy-10y2+x+9y-2=(x-5y+2)(x+2y-1).

x2-y2+5x+3y+4=(x+y+1)(x-y+4).

xy+y2+x-y-2=(y+1)(x+y-2).

6x2-7xy-3y2-xz+7yz-2z2=(2x-3y+z)(3x+y-2z).

a^2+2b^2+3c^2+3aB+4ac+5bc =(a+b+c)(a+2b+3c)

x^2-8x+7 =(x-1)(x-7)

X^2+8X+7= (x+1)(x+7)

X^2-10X-11 =(x-11)(x+1)

x^2+10X-11= ,(x+11)(x-1)

X^+3x-18 =(x+6)(x-3)

x^2+11X+18 =(x+2)(x+9)

x^2-11x+18 =(x-2)(x-9)

x^2+17X-18 =(x+18)(x-1)

X^2-17X-18 =( x-18)(x+1)

xy+6-2x-3y=(x-3)(y-2)

x2(x-y)+y2(y-x)=(x+y)(x-y)^2

2x2-(a-2b)x-ab=(2x-a)(x+b)

a4-9a2b2=a^2(a+3b)(a-3b)

x3+3x2-4=(x-1)(x+2)^2

ab(x2-y2)+xy(a2-b2)=(ay+bx)(ax-by)

(x+y)(a-b-c)+(x-y)(b+c-a)=2y(a-b-c)

a2-a-b2-b=(a+b)(a-b-1)

(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^2

(x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2)

abc+ab-4a=a(bc+b-4)

16x2-81=(4x+9)(4x-9)

9x2-30x+25=(3x-5)^2

x2-7x-30=(x-10)(x+3)

x2-25=(x+5)(x-5)

x2+4x+3=(x+1)(x+3)

4x2-12x+5=(2x-1)(2x-5)

3ax2-6ax=3ax(x-2)

x(x+2)-x=x(x+1)

x2-4x-ax+4a=(x-4)(x-a)

25x2-49=(5x-9)(5x+9)

36x2-60x+25=(6x-5)^2

4x2+12x+9=(2x+3)^2

x2-9x+18=(x-3)(x-6)

2x2-5x-3=(x-3)(2x+1)

12x2-50x+8=2(6x-1)(x-4)

(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-1)

2ax2-3x+2ax-3= (x+1)(2ax-3)

9x2-66x+121=(3x-11)^2

8-2x2=2(2+x)(2-x)

9x2-30x+25=(3x-5)^2

-20x2+9x+20=(-4x+5)(5x+4)

12x2-29x+15=(4x-3)(3x-5)

36x2+39x+9=3(3x+1)(4x+3)

21x2-31x-22=(21x+11)(x-2)

9x4-35x2-4=(9x^2+1)(x+2)(x-2)

(2x+1)(x+1)+(2x+1)(x-3)=2(x-1)(2x+1)

2ax2-3x+2ax-3=(x+1)(2ax-3)

x(y+2)-x-y-1=(x-1)(y+1)

(x2-3x)+(x-3)2=(x-3)(2x-3)

9x2-66x+121=(3x-11)^2

8-2x2=2(2-x)(2+x)

x4-1=(x-1)(x+1)(x^2+1)

x2+4x-xy-2y+4=(x+2)(x-y+2)

4x2-12x+5=(2x-1)(2x-5)

21x2-31x-22=(21x+11)(x-2)

4x2+4xy+y2-4x-2y-3=(2x+y-3)(2x+y+1)

9x5-35x3-4x=x(9x^2+1)(x+2)(x-2)

3x2-6x=3x(x-2)

49x2-25=(7x+5)(7x-5)

6x2-13x+5=(2x-1)(3x-5)

x2+2-3x=(x-1)(x-2)

12x2-23x-24=(3x-8)(4x+3)

(x+6)(x-6)-(x-6)=(x-6)(x+5)

3(x+2)(x-5)-(x+2)(x-3)=2(x-6)(x+2)

9x2+42x+49=(3x+7)^2 。

3a3b2c-6a2b2c2+9ab2c3=3ab^2 c(a^2-2ac+3c^2)

xy+6-2x-3y=(x-3)(y-2)

x2(x-y)+y2(y-x)=(x+y)(x-y)^2

2x2-(a-2b)x-ab=(2x-a)(x+b)

x^3+2x^2-16x-32=(x+2)(x+4)(x-4)

(a-b)a^6+(b-a)b^6=(a-b)^2(a^2+ab+b^2)(a+b)(a^2-ab+b^2)

(x+y)(x+y+2xy)+(xy+1)(xy-1) =(x+1)(y+1)(x+y+xy-1)

X^8+X^7+1 =(X^2+X+1)(X^6-X^4+X^3-X+1)

x^8+x^6+x^4+x^2+1 =(x^4+x^3-x+1)(x^4+x^3+x^2+x+1)

x^2-20x+100=(x-10)^2

x^2-3x+2=(x-1)(x-2)

x^2-2x-15=(x+3)(x-5)

x^2+2x-15=(x-3)(x+5)

x^2-7x+12=(x-3)(x-4)

x^2-7x-30=(x+3)(x-10)

x^2+2x-3=(x-1)(x+3)

x^2-16x+64=(x-8)^2

x^2-9x+20=(x-4)(x-5)

x^2-6x+8=(x-2)(x-4)

x^2-6x-7=(x-7)(x+1)

要给分啊
5

免费初二因式分解练习题和答案


现出的:

1.

ax+by+ay+bx

2.

x^3+1

3.

x^2+x^3

4.

x^2+x^3-2

5.

x^2-6x+8

6.

x^2-12x+35

7.

(x^3-1)+(x-1)(6x+11)

8.

x^4-1

9.

x^4+4

10.

b^2+ab+ac+bc

11.

x^3+y^3+z^3-3xyz

12.

x^6+8x^3+9

13.

x^2-100x+99

14.

x^2-x-y^2-y

15.

7x^2-19x-6

16.

8x^2-6x-9

17.

x+1)(x+2)-12

18.

x^2+(p+q)x+pq

19.

3x^3-6x^2+3

20.

a^2(x-2a)^2-a(x-2a)^2

21.

25m^2-10mn+n^2

22.

x^2-3x-28

23.

y^4+2y^3-3y^2

24.

(x-1)^2*(3x-2)+(2-3x)

25.

(x-2)^2-x+2

26.

x^2-12x-28

27.

12a^2*b(x-y)-4ab(y-x)

28.

a^2+5a+6

29.

x^11-2x^10+x^9

30.

x^2+x

31.

x^3+x

32.

x^4+x

33.

100x^2+30xy+2y^2

34.

6y^2-16y+8

35.

6-7a-5a^2

36.

3x^2-17x+10

37.

6a^2-11ab+3b^2

38.

2m^3+3m^2-5m

39.

(x+y)^2-2(x+y)-3

40.

a^2-b^2+2ab-c^2

41.

m^2+2mn+n^2-1

42.

x^2-4y^2+4yz-z^2

43.

9x^2-4y^2-z^2+4yz

44.

-25+a^2+9b^2-6ab

45.

2x^2-100x-102

46.

x^2*y^2-7xy+10

47.

x^2-x-2

48.

-x^2*y+6xy-8y

49.

x^2-9y^2-x+3y

50.

x^2-7x-8

出不动了。。。

难度不随题号变化,解题方法不随题号变化,老少皆宜,童叟无欺。

答案:

1.

(a+b)(x+y)

2.

(x+1)(x^2-x+1)

3.

x^2*(x+1)

4.

(x-1)(x^2-2x+2)

5.

(x-2)(x-4)

6.

(x-5)(x-7)

7.

(x-1)(x+3)(x+4)

8.

(x^2+1)(x-1)(x+1)

9.

(x^2-2x+2)(x^2+2x+x)

10.

(b+c)(b+a)

11.

(x+y+z)(x^2+y^2+z^2-xy-yz-xz)

12.

(x+1)(x^2-x+1)(x+2)(x^2-2x+4)

13.

(x-99)(x-1)

14.

(x+y)(x-y-1)

15.

(7x+2)(x-3)

16.

(2x-3)(4x+3)

17.

(x+5)(x-2)

18.

(x+p)(x+q)

19.

(x-1)(x^2-x-1)

20.

a(a-1)(x-2a)^2

21.

(5m-n)^2

22.

(x-7)(x+4)

23.

y^2(y-1)(y+3)

24.

x(x-2)(3x-2)

25.

(x-2)(x-3)

26.

(x-14)(x+2)

27.

4ab(3a+1)(x-y)

28.

(a+2)(a+3)

29.

x^9*(x-1)^2

30.

x(1+x)

31.

x(1+x^2)

32.

x(1+x)(1-x+x^2)

33.

2(5x+y)(10x+y)

34.

2(3y-2)(y-2)

35.

(3-5a)(a+2)

36.

(3x-2)(x-5)

37.

(2a-3b)(3a-b)

38.

m(m-1)(2m+5)

39.

(x+y-3)(x+y+1)

40.

(a+b-c)(a+b+c)

41.

(m+n+1)(m+n-1)

42.

(x+2y-z)(x-2y+z)

43.

(3x+2y-z)(3x-2y+z)

44.

(a-3b-5)(a-3b+5)

45.

2(x-51)(x+1)

46.

(xy-5)(xy-2)

47.

(x-2)(x+1)

48.

-y(x-2)(x-4)

49.

(x-y)(x+3y-1)

50.

(x-8)(x+1)
6

因式分解练习题及答案,求!!!


140.m2(p-q)-p+q

141.(2m+3n)(2m-n)-4n(2m-n).

142.(x+2y)2-x2-2xy.

143.a(ab+bc+ac)-abc.

144.ab-a-b+1.

145.xyz-xy-xz+x-yz+y+z-1.

146.x4-2y4-2x3y+xy3.

148.abc(a2+b2+c2)-a3bc+2ab2c2.

149.(a-b-c)(a+b-c)-(b-c-a)(b+c-a).

150.a2(b-c)+b2(c-a)+c2(a-b).

a(a+b)(a-b)-a(a+b)2.

152.(x2-2x)2+2x(x-2)+1.

153.2acd-c2a-ad2.

154.(x-y)2+12(y-x)z+36z2.

156.x2-4ax+8ab-4b2.

157.a2b2+c2d2-2abcd+2ab-2cd+1.

158.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx).

160.(1-a2)(1-b2)-(a2-1)2(b2-1)2.

161.3x4-48y4.

162.(x+1)2-9(x-1)2.

163.(x2+pq)2-(p+q)2x2.

164.(1+2xy)2-(x2+y2)2.

165.4a2b2-(a2+b2)2.

166.4a2b2-(a2+b2-c2)2.

167.(c2-a2-b2)2-4a2b2.

168.(x2-b2+y2-a2)2-4(ab-xy)2.

169.64a4(x+1)2-49b4(x+1)4.

170.ab2-ac2+4ac-4a.

171.4a2-c2+6ab+3bc.

172.x3n+y3n.

174.(x+y)3+125.

176.(m-n)6-(m+n)6.

177.(x+1)6-(x-1)6.

178.a12-b12.

179.(z-x)3-(y+z)3.

180.(3m-2n)3+(3m+2n)3.

181.x6(x2-y2)+y6(y2-x2).

182.8(x+y)3+1.

183.(a-1)3-(b+1)3.

184.(a+b+c)3-a3-b3-c3.

185.x2+4xy+3y2.

186.x2y2-18xy+65.

187.x2+18x-144.

188.x2+30x+144.

189.x4+2x2-8.

190.3x4+6x2-9.

191.-m4+18m2-17.

192.3x4-7x2y2-20y4.

193.x5-2x3-8x.

194.a3-5a2b-300ab2.

195.x8+19x5-216x2.

196.6a4n+k-a2n+k-35ak.

199.30x2+8xy-182y2.

200.m4+14m2-15.

140.(p-q)(m-1)(m+1).

141.(2m-n)2.

142.2y(x+2y).

143.a2(b+c).

144.(b-1)(a-1).

145.(x-1)(y-1)(z-1).

提示:方法一 原式=x(yz-y-z+1)-(yz-y-z+1)

=(yz-y-z+1)(x-1)

=[y(z-1)-(z-1)](x-1)

=(x-1)(y-1)(z-1).

方法二 原式=xy(z-1)-x(z-1)-y(z-1)+(z-1)

=(xy-x-y+1)(z-1)

=[x(y-1)-(y-1)](z-1)

=(x-1)(y-1)(z-1).

146.(x-2y)(x+y)(x2-xy+y2).

提示:方法一 原式=x(x3+y3)-2y(x3+y3)

=(x3+y3)(x-2y)

=(x-2y)(x+y)(x2-xy+y2).

方法二 原式=x3(x-2y)+y3(x-2y)

=(x-2y)(x3+y3)

=(x-2y)(x+y)(x2-xy+y2).

148.abc(b+c)2.

提示:原式=abc(a2+b2+c2-a2+2bc).

149.2(b-c)(a-b-c).

提示:原式=(a-b-c)(a+b-c)+(a-b-c)(b-c-a)

=(a-b-c)[(a+b-c)+(b-c-a)]

=2(b-c)(a-b-c).

150.(a-b)(b-c)(a-c).

提示:原式=a2b-a2c+b2c-ab2+c2(a-b)

=(a2b-ab2)-(a2c-b2c)+c2(a-b)

=ab(a-b)-c(a2-b2)+c2(a-b)

=(a-b)[ab-c(a+b)+c2]

=(a-b)[a(b-c)-c(b-c)]

=(a-b)(b-c)(a-c).

提示:原式=a(a+b)[a-b-(a+b)]=a(a+b)(-2b)

=-2ab(a+b);

152.(x-1)4.

提示:原式=[x(x-2)]2+2•x(x-2)+12

=[x(x-2)+1]2=(x2-2x+1)2

=(x-1)4.

153.-a(c-d)2.

154.(x-y-6z)2.

156.(x-2b)(x-4a+2b).

157.(ab-cd+1)2.

提示:原式=(a2b2-2abcd+c2d2)+2(ab-cd)+1

=(ab-cd)2+2(ab-cd)+1

=(ab-cd+1)2.

158.(ax+by+ay-bx)2.

160.(1+a)(1-a)(1+b)(1-b)(a2+b2-a2b2).

161.3(x2+4y2)(x+2y)(x-2y).

162.4(2x-1)(2-x).

163.(x2+px+qx+pq)(x2-px-qx+pq).

164.(1+x-y)(1-x+y)(x2+y2+2xy+1).

165.-(a+b)2(a-b)2.

166.(a+b+c)(a+b-c)(c+a-b)(c-a+b).

提示:原式=(2ab+a2+b2-c2)(2ab-a2-b2+c2)

=[(a+b)2-c2][c2-(a-b)2]

=(a+b+c)(a+b-c)(c+a-b)(c-a+b).

167.(c+a-b)(c-a+b)(c+a+b)(c-a-b).

168.(x+y+a+b)(x+y-a-b)(x-y+a-b)(x-y-a+b).

提示:原式=(x2-b2+y2-a2+2ab-2xy)(x2-b2+y2-a2-2ab+2xy)

=[(x2-2xy+y2)-(a2-2ab+b2)][(x2+2xy+y2)

-(a2+2ab+b2)]

=[(x-y)2-(a-b)2][(x+y)2-(a+b)2]

=(x-y+a-b)(x-y-a+b)(x+y+a+b)(x+y-a-b).

169.(x+1)2(8a2+7b2x+7b2)(8a2-7b2x-7b2).

170.a(b-c+2)(b+c-2).

提示:原式=a(b2-c2+4c-4)

=a(b2-c2+2b-2b+2c+2c-4)

=a[(b-c)(b+c)-2(b-c)+2(b+c)-4]

=a[(b-c)+2][(b+c)-2].

171.(2a+c)(2a-c+3b).

172.(xn+yn)(x2n-xnyn+y2n).

174.(x+y+5)(x2+2xy+y2-5x-5y+25).

176.-4mn(3n2+m2)(3m2+n2).

提示:原式=[(m-n)3]2-[(m+n)3]2

=[(m-n)3+(m+n)3][(m-n)3-(m+n)3]

=2m[(m-n)2-(m-n)(m+n)(m+n)2]

×{-2n[(m-n)2+(m-n)(m+n)+(m+n)2]}

=-4mn(m2+3n2)(3m2+n2).

177.4x(x2+3)(3x2+1).

提示:原式=[(x+1)3]2-[(x-1)3]2

=[(x+1)3+(x-1)3][(x+1)3-(x-1)3]

=2x[(x+1)2-(x+1)(x-1)+(x-1)2]

×2[(x+1)2+(x+1)(x-1)+(x-1)2]

=4x(x2+3)(3x2+1).

178.(a-b)(a+b)(a2+b2)(a2+ab+b2)(a2-ab+b2)(a4-a2b2+b4).

提示:原式=(a6)2-(b6)2=(a6+b6)(a6-b6)

=[(a2)3+(b2)3][(a3)2-(b3)2]

=(a2+b2)(a4-a2b2+b4)(a3+b3)(a3-b3).

179.-(x+y)(x2+y2+3z2-xy+3yz-3xz).

180.18m(3m2+4n2).

181.(x+y)2(x-y)2(x2-xy+y2)(x2+xy+y2).

提示:原式=(x2-y2)(x6-y6)

=(x+y)(x-y)(x3+y3)(x3-y3).

182.(2x+2y+1)(4x2+8xy+4y2-2x-2y+1).

183.(a-b-2)(a2+ab+b2-a+b+1).

184.3(b+c)(a+b)(c+a).

提示:原式=[(a+b+c)3-a3]-(b3+c3).

185.(x+3y)(x+y).

186.(xy-13)(xy-5).

187.(x-6)(x+24).

188.(x+6)(x+24).

189.(x2-2)(x2+4).

190.3(x2+3)(x+1)(x-1).

191.(m2-17)(1+m)(1-m).

192.(3x2+5y2)(x+2y)(x-2y).

193.x(x+2)(x-2)(x2+2).

194.a(a-20b)(a+15b).

195.x2(x+3)(x2-3x+9)(x-2)(x2+2x+4).

提示:原式=x2(x6+19x3-216)

=x2(x3+27)(x3-8)

=x3(x+3)(x2-3x+9)(x-2)(x2+2x+4).

196.ak(2a2n-5)(3a2n+7).

199.2(3x-7y)(5x+13y).

200.(m2+15)(m+1)(m-1).

201.m2(p-q)-p+q;

202.a(ab+bc+ac)-abc;

203.x4-2y4-2x3y+xy3;

204.abc(a2+b2+c2)-a3bc+2ab2c2;

205.a2(b-c)+b2(c-a)+c2(a-b);

206.(x2-2x)2+2x(x-2)+1;

207.(x-y)2+12(y-x)z+36z2;

208.x2-4ax+8ab-4b2;

209.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx);

210.(1-a2)(1-b2)-(a2-1)2(b2-1)2;

211.(x+1)2-9(x-1)2;

212.4a2b2-(a2+b2-c2)2;

213.ab2-ac2+4ac-4a;

214.x3n+y3n;

215.(x+y)3+125;

216.(3m-2n)3+(3m+2n)3;

217.x6(x2-y2)+y6(y2-x2);

218.8(x+y)3+1;

219.(a+b+c)3-a3-b3-c3;

220.x2+4xy+3y2;

221.x2+18x-144;

222.x4+2x2-8;

223.-m4+18m2-17;

224.x5-2x3-8x;

225.x8+19x5-216x2;

226.(x2-7x)2+10(x2-7x)-24;

227.5+7(a+1)-6(a+1)2;

228.(x2+x)(x2+x-1)-2;

229.x2+y2-x2y2-4xy-1;

230.(x-1)(x-2)(x-3)(x-4)-48;

231.x2-y2-x-y;

232.ax2-bx2-bx+ax-3a+3b;

233.m4+m2+1;

234.a2-b2+2ac+c2;

235.a3-ab2+a-b;

236.625b4-(a-b)4;

237.x6-y6+3x2y4-3x4y2;

238.x2+4xy+4y2-2x-4y-35;

239.m2-a2+4ab-4b2;

240.5m-5n-m2+2mn-n2.

参考答案:

三、因式分解:

1.(p-q)(m-1)(m+1).

8.(x-2b)(x-4a+2b).

11.4(2x-1)(2-x).

20.(x+3y)(x+y).

21.(x-6)(x+24).

27.(3+2a)(2-3a).

31.(x+y)(x-y-1).

38.(x+2y-7)(x+2y+5).

http://wenku.baidu.com/search?word=%D2%F2%CA%BD%B7%D6%BD%E2&lm=0&od=0

-

以上是关于因式分解练习题及答案的问答

Tags:因式分解练习题及答案,初一因式分解练习题及答案,初一因式分解