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1.(3aï¼b)2ï¼4(3aï¼b)(aï¼3b)ï¼4(aï¼3b)2ï¼[3a-b-2(a+3b)]^2=(a-7b)^2
2.(aï¼3)2ï¼6(aï¼3)ï¼(a+3)(a-3)
3(xï¼1)2(xï¼2)ï¼(xï¼1)(xï¼2)2ï¼-(x+1)(x+2)
4.abcï¼abï¼4aï¼a(bc+b-4)
5.16x2ï¼81ï¼(4x+9)(4x-9)
6.9x2ï¼30xï¼25ï¼(3x-5)^2
7.x2ï¼7xï¼30ï¼(x-10)(x+3)
8.x2ï¼25ï¼(x+5)(x-5)
9.x2ï¼20xï¼100ï¼(x-10)^2
10.x2ï¼4xï¼3ï¼(x+1)(x+3)
11.4x2ï¼12xï¼5ï¼(2x-1)(2x-5)
12.3ax2ï¼6axï¼3ax(x-2)
13.x(xï¼2)ï¼xï¼x(x+1)
14.x2ï¼4xï¼axï¼4aï¼(x-4)(x-a)
15.25x2ï¼49ï¼(5x-9)(5x+9)
16.36x2ï¼60xï¼25ï¼(6x-5)^2
17.4x2ï¼12xï¼9ï¼(2x+3)^2
18.x2ï¼9xï¼18ï¼(x-3)(x-6)
19.2x2ï¼5xï¼3ï¼(x-3)(2x+1)
20.12x2ï¼50xï¼8ï¼2(6x-1)(x-4)
21.(xï¼2)(xï¼3)ï¼(xï¼2)(xï¼4)ï¼(x+2)(2x-1)
22.2ax2ï¼3xï¼2axï¼3ï¼ (x+1)(2ax-3)
23.9x2ï¼66xï¼121ï¼(3x-11)^2
24.8ï¼2x2ï¼2(2+x)(2-x)
25.x2ï¼xï¼14 ï¼æ´æ°å
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26.9x2ï¼30xï¼25ï¼(3x-5)^2
27.ï¼20x2ï¼9xï¼20ï¼(-4x+5)(5x+4)
28.12x2ï¼29xï¼15ï¼(4x-3)(3x-5)
29.36x2ï¼39xï¼9ï¼3(3x+1)(4x+3)
30.21x2ï¼31xï¼22ï¼(21x+11)(x-2)
31.9x4ï¼35x2ï¼4ï¼(9x^2+1)(x+2)(x-2)
32.(2xï¼1)(xï¼1)ï¼(2xï¼1)(xï¼3)ï¼2(x-1)(2x+1)
33.2ax2ï¼3xï¼2axï¼3ï¼(x+1)(2ax-3)
34.x(yï¼2)ï¼xï¼yï¼1ï¼(x-1)(y+1)
35.(x2ï¼3x)ï¼(xï¼3)2ï¼(x-3)(2x-3)
36.9x2ï¼66xï¼121ï¼(3x-11)^2
37.8ï¼2x2ï¼2(2-x)(2+x)
38.x4ï¼1ï¼(x-1)(x+1)(x^2+1)
39.x2ï¼4xï¼xyï¼2yï¼4ï¼(x+2)(x-y+2)
40.4x2ï¼12xï¼5ï¼(2x-1)(2x-5)
41.21x2ï¼31xï¼22ï¼(21x+11)(x-2)
42.3x2ï¼6xï¼3x(x-2)
43.49x2ï¼25ï¼(7x+5)(7x-5)
44.6x2ï¼13xï¼5ï¼(2x-1)(3x-5)
45.x2ï¼2ï¼3xï¼(x-1)(x-2)
46.12x2ï¼23xï¼24ï¼(3x-8)(4x+3)
47.(xï¼6)(xï¼6)ï¼(xï¼6)ï¼(x-6)(x+5)
48.3(xï¼2)(xï¼5)ï¼(xï¼2)(xï¼3)ï¼2(x-6)(x+2)
49.9x2ï¼42xï¼49ï¼(3x+7)^2 ã
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