20道因式分解谁有呀急求SOS!!!!!!!!!!!!!SOS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 几道计算和因式分解啦，sos ！！！！！！！！悬赏20！！！...
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(x^m+2)\uff08-x^m-2)
=-(x^m+2)²
=-x^2m-4x^m-4
\u56e0\u5f0f\u5206\u89e3\uff1a\uff08x^2-5x)(x^2-5x-10\uff09-56
=(x²-5x)²-10(x²-5x)-56
=(x²-5x-14)(x²-5x+4)
=(x-7)(x+2)(x-4)(x-1)
\uff08a+1)(a+2)(a+3)(a+4\uff09-3
=(a²+5a+4)(a²+5a+6)-3
=(a²+5a+4)²+2(a²+5a+4)-3
=(a²+5a+4+3)(a²+5a+4-1)
=(a²+5a+7)(a²+5a+3)
2.(a＋3)2－6(a＋3)＝(a+3)(a-3)
3(x＋1)2(x＋2)－(x＋1)(x＋2)2＝-(x+1)(x+2)
4.abc＋ab－4a＝a(bc+b-4)
5.16x2－81＝(4x+9)(4x-9)
6.9x2－30x＋25＝(3x-5)^2
7.x2－7x－30＝(x-10)(x+3)
8.x2－25＝(x+5)(x-5)
9.x2－20x＋100＝(x-10)^2
10.x2＋4x＋3＝(x+1)(x+3)
11.4x2－12x＋5＝(2x-1)(2x-5)
12.3ax2－6ax＝3ax(x-2)
13.x(x＋2)－x＝x(x+1)
14.x2－4x－ax＋4a＝(x-4)(x-a)
15.25x2－49＝(5x-9)(5x+9)
16.36x2－60x＋25＝(6x-5)^2
17.4x2＋12x＋9＝(2x+3)^2
18.x2－9x＋18＝(x-3)(x-6)
19.2x2－5x－3＝(x-3)(2x+1)
20.12x2－50x＋8＝2(6x-1)(x-4)
21.(x＋2)(x－3)＋(x＋2)(x＋4)＝(x+2)(2x-1)
22.2ax2－3x＋2ax－3＝ (x+1)(2ax-3)
23.9x2－66x＋121＝(3x-11)^2
24.8－2x2＝2(2+x)(2-x)
25.x2－x＋14 ＝整数内无法分解
26.9x2－30x＋25＝(3x-5)^2
27.－20x2＋9x＋20＝(-4x+5)(5x+4)
28.12x2－29x＋15＝(4x-3)(3x-5)
29.36x2＋39x＋9＝3(3x+1)(4x+3)
30.21x2－31x－22＝(21x+11)(x-2)
31.9x4－35x2－4＝(9x^2+1)(x+2)(x-2)
32.(2x＋1)(x＋1)＋(2x＋1)(x－3)＝2(x-1)(2x+1)
33.2ax2－3x＋2ax－3＝(x+1)(2ax-3)
34.x(y＋2)－x－y－1＝(x-1)(y+1)
35.(x2－3x)＋(x－3)2＝(x-3)(2x-3)
36.9x2－66x＋121＝(3x-11)^2
37.8－2x2＝2(2-x)(2+x)
38.x4－1＝(x-1)(x+1)(x^2+1)
39.x2＋4x－xy－2y＋4＝(x+2)(x-y+2)
40.4x2－12x＋5＝(2x-1)(2x-5)
41.21x2－31x－22＝(21x+11)(x-2)
42.3x2－6x＝3x(x-2)
43.49x2－25＝(7x+5)(7x-5)
44.6x2－13x＋5＝(2x-1)(3x-5)
45.x2＋2－3x＝(x-1)(x-2)
46.12x2－23x－24＝(3x-8)(4x+3)
47.(x＋6)(x－6)－(x－6)＝(x-6)(x+5)
48.3(x＋2)(x－5)－(x＋2)(x－3)＝2(x-6)(x+2)
49.9x2＋42x＋49＝(3x+7)^2 。
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