帮我出几道因式分解，带答案的，长一点？！！！ 帮我出几道因式分解,初一的
\u7ed9\u6211\u51fa\u51e0\u9053\u56e0\u5f0f\u5206\u89e3\u7684\u9898\uff01\u8981\u7b54\u6848\uff0c\u8be6\u7ec6\u4e00\u70b9\uff01\u8c22\u8c22\uff01(1)1-4x²-4y²+8xy
(2)3x²-8x-3
(3)4x²-4x-y²+4y-3
(4)x²+xy-6y²+x+13y-6
(5)(x²+xy+y²)²-4xy(x²+y²)
\u7b54\u6848\uff1a
\uff081\uff09\u5206\u6790\uff1a\u7b2c\u4e00\u9898\u662f\u8fd0\u7528\u4e86\u5206\u7ec4\u7ed3\u5408\u6cd5\u3002
\u539f\u5f0f=1-\uff084x²+4y²-8xy\uff09
=1-4\uff08x-y)²
= [1+2(x-y)][1-2(x-y)]
=(1+2x-2y)(1-2x+2x)
(2)\u5206\u6790\uff1a\u672c\u9898\u7528\u4e86\u5341\u5b57\u76f8\u4e58\u6cd5\u3002
\u56e0\u4e3a;3x +1
x -3
\u6240\u4ee5\uff1a\u539f\u5f0f=\uff083x+1)(x-3)
\uff083\uff09\u5206\u6790;\u672c\u9898\u8fd0\u7528\u4e86\u62c6\u9879\u7ec4\u5408\u6cd5\uff1a\u628a-3\u62c6\u6210-3=1-4
\u539f\u5f0f=\uff08 4x²-4x+1\uff09-\uff08y²-4y+4\uff09
=\uff082x-1)²-\uff08y-2)²
=\uff082x+y-3)(2x-y+1)
\uff084\uff09\u5206\u6790\uff1a\u5f85\u5b9a\u7cfb\u6570\u6cd5
\u89e3\uff1a\u8bbex²+xy-6y²+x+13y-6=\uff08x+3y+m)\uff08x-2y+n)
=x²-2xy+nx+3xy-6y²+3ny+mx-2my+mn
=x²+xy-6y²+(n+m)x+(3n-2m)y+mn
\u4e0e\u539f\u5f0f\u5bf9\u6bd4\u5bf9\u5e94\u9879\u7cfb\u6570\uff0c\u5f97\uff1a
m+n=1
3m-2n=13
mn=-6
\u89e3\u5f97\uff1am=-2 n=3
\u6240\u4ee5\u539f\u5f0f=\uff08x+3y-2)\uff08x-2y+3)
\uff085\uff09\u6362\u5143\u6cd5;
\u4ee4a=x+y ,xy=b
\u5219\uff1a\u539f\u5f0f=a\uff08a+2b)+(b+1)(b-1)
=a²+2ab+b²-1
=(a+b)²-1
=(a+b+1)(x+b-1)
=(x+y+xy+1)\uff08x+y+xy-1\uff09
=\uff08x+1)(y+1)(x+y+xy-1)
\u4e00X^8-Y^8
\u4e8c\u4e0d\u89e3\u65b9\u7a0b\u7ec42x+Y=6,x-3y=1,\u6c42:7y(x-3y)^2-2(3y-x)\u7684\u503c
\u4e09(x^2+4)^2+8x(x^2+4)+16x^2
\u56db-4x^2y+2x^2+6x^3y^2z
\u4e9416m(m-n)^2+56(n-m)^3
\u516d(2a+3b)(a-2b)-(3a+2b)(2b-a)
\u4e034m^2+8m+4
(x^2+4)^2+8x(X^2+4)+16x^2
x^2+4y^2-4xy-1
================================
X^2\u4ee3\u8868\u662fX\u76842\u6b21\u65b9
X^3\u5c31\u662f3\u6b21\u65b9
Y\u4e5f\u4e00\u6837
================================
\u7b54\u6848\uff1a
X^8-Y^8
=(x^4+y^4))(x^4-y^4)
\uff1d(x^4+y^4)(x^2+y^2)(x^2-y^2)
\uff1d(x^4+y^4)(x^2+y^2)(x+y)(x-y)
2x+Y=6,x-3y=1,
7y(x-3y)^2-2(3y-x)
=7y(x-3y)^2+2(x-3y)
=7y*1^2+2x-6y
=2x+y
=6
(x^2+4)^2+8x(x^2+4)+16x^2
=(x^2+4+4x)^2
=(x+2)^4
-4x^2y+2x^2+6x^3y^2z
=2x^2(1-2y+3xy^2z)
16m(m-n)^2+56(n-m)^3
=16m(m-n)^2-56(m-n)^3
=8(m-n)^2(2m-7m+7n)
=8(m-n)^2(7n-5m)
(2a+3b)(a-2b)-(3a+2b)(2b-a)
=2a^2-ab-6b^2+3a^2-4ab-4b^2
=5a^2-5ab-10b^2
=5(a^2-ab-2b^2)
=5(a-2b)(a+b)
4m^2+8m+4
=4(m^2+2m+1)
=4(m+1)^2
(x^2+4)^2+8x(x^2+4)+16x^2
=(x^2+4+4x)^2
=(x+2)^4
x^2+4y^2-4xy-1
=(x-2y)^2-1
=(x-2y+1(x-2y-1)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\u56e0\u5f0f\u5206\u89e33a3b2c\uff0d6a2b2c2\uff0b9ab2c3\uff1d
3.\u56e0\u5f0f\u5206\u89e3xy\uff0b6\uff0d2x\uff0d3y\uff1d
4.\u56e0\u5f0f\u5206\u89e3x2(x\uff0dy)\uff0by2(y\uff0dx)\uff1d
5.\u56e0\u5f0f\u5206\u89e32x2\uff0d(a\uff0d2b)x\uff0dab\uff1d
6.\u56e0\u5f0f\u5206\u89e3a4\uff0d9a2b2\uff1d
7.\u82e5\u5df2\u77e5x3\uff0b3x2\uff0d4\u542b\u6709x\uff0d1\u7684\u56e0\u5f0f\uff0c\u8bd5\u5206\u89e3x3\uff0b3x2\uff0d4\uff1d
8.\u56e0\u5f0f\u5206\u89e3ab(x2\uff0dy2)\uff0bxy(a2\uff0db2)\uff1d
9.\u56e0\u5f0f\u5206\u89e3(x\uff0by)(a\uff0db\uff0dc)\uff0b(x\uff0dy)(b\uff0bc\uff0da)\uff1d
10.\u56e0\u5f0f\u5206\u89e3a2\uff0da\uff0db2\uff0db\uff1d
11.\u56e0\u5f0f\u5206\u89e3(3a\uff0db)2\uff0d4(3a\uff0db)(a\uff0b3b)\uff0b4(a\uff0b3b)2\uff1d
12.\u56e0\u5f0f\u5206\u89e3(a\uff0b3)2\uff0d6(a\uff0b3)\uff1d
13.\u56e0\u5f0f\u5206\u89e3(x\uff0b1)2(x\uff0b2)\uff0d(x\uff0b1)(x\uff0b2)2\uff1d
abc\uff0bab\uff0d4a\uff1d \u3002
(2)16x2\uff0d81\uff1d \u3002
(3)9x2\uff0d30x\uff0b25\uff1d \u3002
(4)x2\uff0d7x\uff0d30\uff1d
35.\u56e0\u5f0f\u5206\u89e3x2\uff0d25\uff1d \u3002
36.\u56e0\u5f0f\u5206\u89e3x2\uff0d20x\uff0b100\uff1d \u3002
37.\u56e0\u5f0f\u5206\u89e3x2\uff0b4x\uff0b3\uff1d \u3002
38.\u56e0\u5f0f\u5206\u89e34x2\uff0d12x\uff0b5\uff1d \u3002
39.\u56e0\u5f0f\u5206\u89e3\u4e0b\u5217\u5404\u5f0f\uff1a
(1)3ax2\uff0d6ax\uff1d \u3002
(2)x(x\uff0b2)\uff0dx\uff1d \u3002
(3)x2\uff0d4x\uff0dax\uff0b4a\uff1d \u3002
(4)25x2\uff0d49\uff1d \u3002
(5)36x2\uff0d60x\uff0b25\uff1d \u3002
(6)4x2\uff0b12x\uff0b9\uff1d \u3002
(7)x2\uff0d9x\uff0b18\uff1d \u3002
(8)2x2\uff0d5x\uff0d3\uff1d \u3002
(9)12x2\uff0d50x\uff0b8\uff1d \u3002
40.\u56e0\u5f0f\u5206\u89e3(x\uff0b2)(x\uff0d3)\uff0b(x\uff0b2)(x\uff0b4)\uff1d \u3002
41.\u56e0\u5f0f\u5206\u89e32ax2\uff0d3x\uff0b2ax\uff0d3\uff1d \u3002
42.\u56e0\u5f0f\u5206\u89e39x2\uff0d66x\uff0b121\uff1d \u3002
43.\u56e0\u5f0f\u5206\u89e38\uff0d2x2\uff1d \u3002
44.\u56e0\u5f0f\u5206\u89e3x2\uff0dx\uff0b14 \uff1d \u3002
45.\u56e0\u5f0f\u5206\u89e39x2\uff0d30x\uff0b25\uff1d \u3002
46.\u56e0\u5f0f\u5206\u89e3\uff0d20x2\uff0b9x\uff0b20\uff1d \u3002
47.\u56e0\u5f0f\u5206\u89e312x2\uff0d29x\uff0b15\uff1d \u3002
48.\u56e0\u5f0f\u5206\u89e336x2\uff0b39x\uff0b9\uff1d \u3002
49.\u56e0\u5f0f\u5206\u89e321x2\uff0d31x\uff0d22\uff1d \u3002
50.\u56e0\u5f0f\u5206\u89e39x4\uff0d35x2\uff0d4\uff1d \u3002
51.\u56e0\u5f0f\u5206\u89e3(2x\uff0b1)(x\uff0b1)\uff0b(2x\uff0b1)(x\uff0d3)\uff1d \u3002
52.\u56e0\u5f0f\u5206\u89e32ax2\uff0d3x\uff0b2ax\uff0d3\uff1d \u3002
53.\u56e0\u5f0f\u5206\u89e3x(y\uff0b2)\uff0dx\uff0dy\uff0d1\uff1d \u3002
54.\u56e0\u5f0f\u5206\u89e3(x2\uff0d3x)\uff0b(x\uff0d3)2\uff1d \u3002
55.\u56e0\u5f0f\u5206\u89e39x2\uff0d66x\uff0b121\uff1d \u3002
56.\u56e0\u5f0f\u5206\u89e38\uff0d2x2\uff1d \u3002
57.\u56e0\u5f0f\u5206\u89e3x4\uff0d1\uff1d \u3002
58.\u56e0\u5f0f\u5206\u89e3x2\uff0b4x\uff0dxy\uff0d2y\uff0b4\uff1d \u3002
59.\u56e0\u5f0f\u5206\u89e34x2\uff0d12x\uff0b5\uff1d \u3002
60.\u56e0\u5f0f\u5206\u89e321x2\uff0d31x\uff0d22\uff1d \u3002
61.\u56e0\u5f0f\u5206\u89e34x2\uff0b4xy\uff0by2\uff0d4x\uff0d2y\uff0d3\uff1d \u3002
62.\u56e0\u5f0f\u5206\u89e39x5\uff0d35x3\uff0d4x\uff1d \u3002
63.\u56e0\u5f0f\u5206\u89e3\u4e0b\u5217\u5404\u5f0f\uff1a
(1)3x2\uff0d6x\uff1d \u3002
(2)49x2\uff0d25\uff1d \u3002
(3)6x2\uff0d13x\uff0b5\uff1d \u3002
(4)x2\uff0b2\uff0d3x\uff1d \u3002
(5)12x2\uff0d23x\uff0d24\uff1d \u3002
(6)(x\uff0b6)(x\uff0d6)\uff0d(x\uff0d6)\uff1d \u3002
(7)3(x\uff0b2)(x\uff0d5)\uff0d(x\uff0b2)(x\uff0d3)\uff1d \u3002
(8)9x2\uff0b42x\uff0b49\uff1d
~==============================
X2\u4ee3\u8868x\u76842\u6b21\u65b9
+================================
\u7b54\u6848\uff1a
\u56e0\u5f0f\u5206\u89e33a3b2c\uff0d6a2b2c2\uff0b9ab2c3\uff1d3ab^2 c(a^2-2ac+3c^2)
3.\u56e0\u5f0f\u5206\u89e3xy\uff0b6\uff0d2x\uff0d3y\uff1d(x-3)(y-2)
4.\u56e0\u5f0f\u5206\u89e3x2(x\uff0dy)\uff0by2(y\uff0dx)\uff1d(x+y)(x-y)^2
5.\u56e0\u5f0f\u5206\u89e32x2\uff0d(a\uff0d2b)x\uff0dab\uff1d(2x-a)(x+b)
6.\u56e0\u5f0f\u5206\u89e3a4\uff0d9a2b2\uff1da^2(a+3b)(a-3b)
7.\u82e5\u5df2\u77e5x3\uff0b3x2\uff0d4\u542b\u6709x\uff0d1\u7684\u56e0\u5f0f\uff0c\u8bd5\u5206\u89e3x3\uff0b3x2\uff0d4\uff1d(x-1)(x+2)^2
8.\u56e0\u5f0f\u5206\u89e3ab(x2\uff0dy2)\uff0bxy(a2\uff0db2)\uff1d(ay+bx)(ax-by)
9.\u56e0\u5f0f\u5206\u89e3(x\uff0by)(a\uff0db\uff0dc)\uff0b(x\uff0dy)(b\uff0bc\uff0da)\uff1d2y(a-b-c)
10.\u56e0\u5f0f\u5206\u89e3a2\uff0da\uff0db2\uff0db\uff1d(a+b)(a-b-1)
11.\u56e0\u5f0f\u5206\u89e3(3a\uff0db)2\uff0d4(3a\uff0db)(a\uff0b3b)\uff0b4(a\uff0b3b)2\uff1d[3a-b-2(a+3b)]^2=(a-7b)^2
12.\u56e0\u5f0f\u5206\u89e3(a\uff0b3)2\uff0d6(a\uff0b3)\uff1d(a+3)(a-3)
13.\u56e0\u5f0f\u5206\u89e3(x\uff0b1)2(x\uff0b2)\uff0d(x\uff0b1)(x\uff0b2)2\uff1d-(x+1)(x+2)
abc\uff0bab\uff0d4a\uff1da(bc+b-4)
(2)16x2\uff0d81\uff1d(4x+9)(4x-9)
(3)9x2\uff0d30x\uff0b25\uff1d(3x-5)^2
(4)x2\uff0d7x\uff0d30\uff1d(x-10)(x+3)
35.\u56e0\u5f0f\u5206\u89e3x2\uff0d25\uff1d(x+5)(x-5)
36.\u56e0\u5f0f\u5206\u89e3x2\uff0d20x\uff0b100\uff1d(x-10)^2
37.\u56e0\u5f0f\u5206\u89e3x2\uff0b4x\uff0b3\uff1d(x+1)(x+3)
38.\u56e0\u5f0f\u5206\u89e34x2\uff0d12x\uff0b5\uff1d(2x-1)(2x-5)
39.\u56e0\u5f0f\u5206\u89e3\u4e0b\u5217\u5404\u5f0f\uff1a
(1)3ax2\uff0d6ax\uff1d3ax(x-2)
(2)x(x\uff0b2)\uff0dx\uff1dx(x+1)
(3)x2\uff0d4x\uff0dax\uff0b4a\uff1d(x-4)(x-a)
(4)25x2\uff0d49\uff1d(5x-9)(5x+9)
(5)36x2\uff0d60x\uff0b25\uff1d(6x-5)^2
(6)4x2\uff0b12x\uff0b9\uff1d(2x+3)^2
(7)x2\uff0d9x\uff0b18\uff1d(x-3)(x-6)
(8)2x2\uff0d5x\uff0d3\uff1d(x-3)(2x+1)
(9)12x2\uff0d50x\uff0b8\uff1d2(6x-1)(x-4)
40.\u56e0\u5f0f\u5206\u89e3(x\uff0b2)(x\uff0d3)\uff0b(x\uff0b2)(x\uff0b4)\uff1d(x+2)(2x-1)
41.\u56e0\u5f0f\u5206\u89e32ax2\uff0d3x\uff0b2ax\uff0d3\uff1d (x+1)(2ax-3)
42.\u56e0\u5f0f\u5206\u89e39x2\uff0d66x\uff0b121\uff1d(3x-11)^2
43.\u56e0\u5f0f\u5206\u89e38\uff0d2x2\uff1d2(2+x)(2-x)
44.\u56e0\u5f0f\u5206\u89e3x2\uff0dx\uff0b14 \uff1d\u6574\u6570\u5185\u65e0\u6cd5\u5206\u89e3
45.\u56e0\u5f0f\u5206\u89e39x2\uff0d30x\uff0b25\uff1d(3x-5)^2
46.\u56e0\u5f0f\u5206\u89e3\uff0d20x2\uff0b9x\uff0b20\uff1d(-4x+5)(5x+4)
47.\u56e0\u5f0f\u5206\u89e312x2\uff0d29x\uff0b15\uff1d(4x-3)(3x-5)
48.\u56e0\u5f0f\u5206\u89e336x2\uff0b39x\uff0b9\uff1d3(3x+1)(4x+3)
49.\u56e0\u5f0f\u5206\u89e321x2\uff0d31x\uff0d22\uff1d(21x+11)(x-2)
50.\u56e0\u5f0f\u5206\u89e39x4\uff0d35x2\uff0d4\uff1d(9x^2+1)(x+2)(x-2)
51.\u56e0\u5f0f\u5206\u89e3(2x\uff0b1)(x\uff0b1)\uff0b(2x\uff0b1)(x\uff0d3)\uff1d2(x-1)(2x+1)
52.\u56e0\u5f0f\u5206\u89e32ax2\uff0d3x\uff0b2ax\uff0d3\uff1d(x+1)(2ax-3)
53.\u56e0\u5f0f\u5206\u89e3x(y\uff0b2)\uff0dx\uff0dy\uff0d1\uff1d(x-1)(y+1)
54.\u56e0\u5f0f\u5206\u89e3(x2\uff0d3x)\uff0b(x\uff0d3)2\uff1d(x-3)(2x-3)
55.\u56e0\u5f0f\u5206\u89e39x2\uff0d66x\uff0b121\uff1d(3x-11)^2
56.\u56e0\u5f0f\u5206\u89e38\uff0d2x2\uff1d2(2-x)(2+x)
57.\u56e0\u5f0f\u5206\u89e3x4\uff0d1\uff1d(x-1)(x+1)(x^2+1)
58.\u56e0\u5f0f\u5206\u89e3x2\uff0b4x\uff0dxy\uff0d2y\uff0b4\uff1d(x+2)(x-y+2)
59.\u56e0\u5f0f\u5206\u89e34x2\uff0d12x\uff0b5\uff1d(2x-1)(2x-5)
60.\u56e0\u5f0f\u5206\u89e321x2\uff0d31x\uff0d22\uff1d(21x+11)(x-2)
61.\u56e0\u5f0f\u5206\u89e34x2\uff0b4xy\uff0by2\uff0d4x\uff0d2y\uff0d3\uff1d(2x+y-3)(2x+y+1)
62.\u56e0\u5f0f\u5206\u89e39x5\uff0d35x3\uff0d4x\uff1dx(9x^2+1)(x+2)(x-2)
63.\u56e0\u5f0f\u5206\u89e3\u4e0b\u5217\u5404\u5f0f\uff1a
(1)3x2\uff0d6x\uff1d3x(x-2)
(2)49x2\uff0d25\uff1d(7x+5)(7x-5)
(3)6x2\uff0d13x\uff0b5\uff1d(2x-1)(3x-5)
(4)x2\uff0b2\uff0d3x\uff1d(x-1)(x-2)
(5)12x2\uff0d23x\uff0d24\uff1d(3x-8)(4x+3)
(6)(x\uff0b6)(x\uff0d6)\uff0d(x\uff0d6)\uff1d(x-6)(x+5)
(7)3(x\uff0b2)(x\uff0d5)\uff0d(x\uff0b2)(x\uff0d3)\uff1d2(x-6)(x+2)
(8)9x2\uff0b42x\uff0b49\uff1d(3x+7)^2 \u3002
一、填空题：
2．(a－3)(3－2a)=_______(3－a)(3－2a)；
12．若m2－3m＋2=(m＋a)(m＋b)，则a=______，b=______；
15．当m=______时，x2＋2(m－3)x＋25是完全平方式．
二、选择题：
1．下列各式的因式分解结果中，正确的是( )
A．a2b＋7ab－b＝b(a2＋7a) B．3x2y－3xy－6y=3y(x－2)(x＋1)
C．8xyz－6x2y2＝2xyz(4－3xy) D．－2a2＋4ab－6ac＝－2a(a＋2b－3c)
1/11
A．(n－2)(m＋m2) B．(n－2)(m－m2) C．m(n－2)(m＋1) D．m(n－2)(m－1)
3．在下列等式中，属于因式分解的是( )
A．a(x－y)＋b(m＋n)＝ax＋bm－ay＋bn B．a2－2ab＋b2＋1=(a－b)2＋1
C．－4a2＋9b2＝(－2a＋3b)(2a＋3b) D．x2－7x－8=x(x－7)－8
4．下列各式中，能用平方差公式分解因式的是( )
A．a2＋b2 B．－a2＋b2 C．－a2－b2 D．－(－a2)＋b2
5．若9x2＋mxy＋16y2是一个完全平方式，那么m的值是( )
A．－12 B．±24 C．12 D．±12
6．把多项式an+4－an+1分解得( )
A．an(a4－a) B．an-1(a3－1) C．an+1(a－1)(a2－a＋1) D．an+1(a－1)(a2＋a＋1)
7．若a2＋a＝－1，则a4＋2a3－3a2－4a＋3的值为( )
A．8 B．7 C．10 D．12
8．已知x2＋y2＋2x－6y＋10=0，那么x，y的值分别为( )
A．x=1，y=3 B．x=1，y=－3 C．x=－1，y=3 D．x=1，y=－3
9．把(m2＋3m)4－8(m2＋3m)2＋16分解因式得( )
A．(m＋1)4(m＋2)2 B．(m－1)2(m－2)2(m2＋3m－2)
C．(m＋4)2(m－1)2 D．(m＋1)2(m＋2)2(m2＋3m－2)2
10．把x2－7x－60分解因式，得( )
A．(x－10)(x＋6) B．(x＋5)(x－12) C．(x＋3)(x－20) D．(x－5)(x＋12)
11．把3x2－2xy－8y2分解因式，得( )
A．(3x＋4)(x－2) B．(3x－4)(x＋2) C．(3x＋4y)(x－2y) D．(3x－4y)(x＋2y)
12．把a2＋8ab－33b2分解因式，得( )
A．(a＋11)(a－3) B．(a－11b)(a－3b) C．(a＋11b)(a－3b) D．(a－11b)(a＋3b)
13．把x4－3x2＋2分解因式，得( )
2/11
C．(x2＋2)(x2＋1) D．(x2＋2)(x＋1)(x－1)
14．多项式x2－ax－bx＋ab可分解因式为( )
A．－(x＋a)(x＋b) B．(x－a)(x＋b) C．(x－a)(x－b) D．(x＋a)(x＋b)
15．一个关于x的二次三项式，其x2项的系数是1，常数项是－12，且能分解因式，这样的二次三项式是( )
A．x2－11x－12或x2＋11x－12 B．x2－x－12或x2＋x－12
C．x2－4x－12或x2＋4x－12 D．以上都可以
16．下列各式x3－x2－x＋1，x2＋y－xy－x，x2－2x－y2＋1，(x2＋3x)2－(2x＋1)2中，不含有(x－1)因式的有( )
A．1个 B．2个 C．3个 D．4个
17．把9－x2＋12xy－36y2分解因式为( )
A．(x－6y＋3)(x－6x－3) B．－(x－6y＋3)(x－6y－3)
C．－(x－6y＋3)(x＋6y－3) D．－(x－6y＋3)(x－6y＋3)
18．下列因式分解错误的是( )
A．a2－bc＋ac－ab=(a－b)(a＋c) B．ab－5a＋3b－15=(b－5)(a＋3)
C．x2＋3xy－2x－6y=(x＋3y)(x－2) D．x2－6xy－1＋9y2=(x＋3y＋1)(x＋3y－1)
19．已知a2x2±2x＋b2是完全平方式，且a，b都不为零，则a与b的关系为( )
A．互为倒数或互为负倒数 B．互为相反数
C．相等的数 D．任意有理数
20．对x4＋4进行因式分解，所得的正确结论是( )
A．不能分解因式 B．有因式x2＋2x＋2 C．(xy＋2)(xy－8) D．(xy－2)(xy－8)
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