帮忙出50道初二数学因式分解的题目急!
1.x² －25＝2.x²－20x＋100＝
3.x²＋4x＋3＝
4.4x²－12x＋5＝
5.3ax²－6ax＝
6.x(x＋2)－x＝
7.x²－4x－ax＋4a＝
8.25x²－49＝
9.36x²－60x＋25＝
10.4x²＋12x＋9＝
11.x²－9x＋18＝
12.2x²－5x－3＝
13.12x²－50x＋8＝
14.(x＋2)(x－3)＋(x＋2)(x＋4)＝
15.2ax²－3x＋2ax－3＝
16.9x²－66x＋121＝
17.8－2x²＝
18.x²－x＋14 ＝
19.9x²－30x＋25＝
20.－20x²＋9x＋20＝
21.12x²－29x＋15＝
22.36x²＋39x＋9＝
23.21x²－31x－22＝
24.9x4－35x²－4＝
25.(2x＋1)(x＋1)＋(2x＋1)(x－3)＝
26.2ax²－3x＋2ax－3＝
27.x(y＋2)－x－y－1＝
28.(x²－3x)＋(x－3)2＝
29.9x²－66x＋121＝
30.8－2x²＝
31.x4－1＝
32.x²＋4x－xy－2y＋4＝
33.4x²－12x＋5＝
34.21x²－31x－22＝
35.4x²＋4xy＋y2－4x－2y－3＝
36.9x5－35x3－4x＝
37.3x²－6x＝
38.49x²－25＝
39.6x²－13x＋5＝
40.x²＋2－3x＝
41.12x²－23x－24＝
42.(x＋6)(x－6)－(x－6)＝
43.3(x＋2)(x－5)－(x＋2)(x－3)＝
44.9x²＋42x＋49＝
45.(x＋2)－2(x＋2)2＝
46.36x²＋39x＋9＝
47.2x²＋ax－6x－3a＝
48.22x²－31x－21＝
49.3ax²－6ax＝
50.(x＋1)x－5x＝
51.(2x＋1)(x－3)－(2x＋1)(x－5)＝
52.xy＋2x－5y－10＝
53.x2y2－x²－y²－6xy＋4＝
54.8x2－18
55.x2－(a－b)x－ab
56.9x4＋35x2－4
57.x2－y2－2yz－z2
58.a(b2－c2)－c(a2－b2)
59.(2x＋1)(x＋1)＋(2x＋1)(x－3)
60.39x2－38x＋8
61 7(x－1)2＋4(x－1)(y＋2)－20(y+2)2
62.xy2－2xy－3x－y2－2y－1
63.4x2－6ax＋18a2
64.20a3bc－9a2b2c－20ab3c
65.2ax2－5x＋2ax－5
66.4x3＋4x2－25x－25
67.(1－xy)2－(y－x)2
68.mx2－m2－x＋1
69.a2－2ab＋b2－1
70.5x2－45
71.81x3－9x
72.x2－y2－5x－5y
73.x2－y2＋2yz－z2
74.xy2－2xy－3x－y2－2y－1
75.y2(x－y)＋z2(y－x)
绛旓細宸鍒嗚В
绛旓細锛1锛墄²-4xy+4y²-10x+20y+25 =x²-2脳2xy+锛2y锛²-锛10x-20y锛+25 =(x-2y)²-2脳5锛坸-2y)+5²=(x-2y-5)²(2)(n+1)(n+2)(n+3)(n+4)+1 =(n+1)(n+4)(n+2)(n+3)+1 =(n²+5n+4)(n²+5n+6)+1 =[锛...
绛旓細鍥炵瓟锛=1/2*(x^2+2xy+y^2)=1/2*[(x+y)^2銆=1/2*1=1/2
绛旓細1. 1锛弜锛1 锛1锛弜²锛1 梅 1锛弜²锛2x锛1 =1锛弜锛1 锛1锛(x锛1)(x锛1) 脳(x²锛2x锛1)=1锛弜锛1锛1锛(x锛1)(x锛1) 脳(x锛1)²=1锛弜锛1 锛 x锛1锛弜锛1 =(1锛峹锛1)锛弜锛1 =2锛峹锛弜锛1 2.x²锛8x锛弜²...
绛旓細25X鐨勫钩鏂-16Y鐨勫钩鏂 =锛5x+4y锛(5x-4y);(a-b)(x-y)-(b-a)(x+y)=(a-b)(x-y+x+y)=2x(a-b);4+12(x-y)+9(x+y)鐨勫钩鏂 =(3(x+y)+2)²=(3x+3y+2)²;x鐨勭珛鏂-9x =x(x²-9)=x(x+3)(x-3);6xy鐨勫钩鏂-9x鐨勫钩鏂箉-y鐨勭珛鏂 =-(3x-y)&#...
绛旓細4.x(x-y)^2-y(y-x)^2 =x(x^2-2xy+y^2)-y(y^2-2xy+x^2)=x^3-2x^2y+xy^2+xy^2-y^3+2xy^2-x^2y =x^3-y^3+3xy^2-3x^2y =(x-y)(x^2+xy+y^2)+3xy(y-x)=(x-y)(x^2-2xy+y^2)=(x-y)^3 5.m(a^2+b^2)+n(a^2+b^2)=(m+n)(a^2+b^2...
绛旓細1.(3a锛峛)2锛4(3a锛峛)(a锛3b)锛4(a锛3b)2锛漑3a-b-2(a+3b)]^2=(a-7b)^2 2.(a锛3)2锛6(a锛3)锛(a+3)(a-3) 3(x锛1)2(x锛2)锛(x锛1)(x锛2)2锛-(x+1)(x+2) 4.abc锛媋b锛4a锛漚(bc+b-4) 5.16x2锛81锛(4x+9)(4x-9) 6.9x2锛30x锛25锛(3x-5)^...
绛旓細9(a-b)²+12(a²-b²)+4(a+b)²=(3(a-b))+2*3*2(a+b)(a-b)+(2(a+b))²=(3(a-b)+2(a+b))²=(5a-b)²a³-10a²+25a =a(a²-2*5*a+5²)=a(a-5)²x²+2x+1-y²=(x+1)&#...
绛旓細25.x2锛峹锛14 锛濇暣鏁板唴鏃犳硶鍒嗚В 26.9x2锛30x锛25锛(3x-5)^2 27.锛20x2锛9x锛20锛(-4x+5)(5x+4)28.12x2锛29x锛15锛(4x-3)(3x-5)29.36x2锛39x锛9锛3(3x+1)(4x+3)30.21x2锛31x锛22锛(21x+11)(x-2)31.9x4锛35x2锛4锛(9x^2+1)(x+2)(x-2)32.(2x锛1)(x...
绛旓細(1) 6x4y2锛12x3y锛27x2y3 =3x2y路2x2y锛3x2y路4x锛3x2y路9y2=3x2y(2x2y锛4x锛9y2)(2)锛峹4y锛媥3y2锛峹2y3=锛(x4y锛峹3y2锛媥2y3)=锛(x2y路x2锛峹2y路xy锛媥2y路y2)=锛峹2y(x2锛峹y锛媦2)(3)xn锛3xn锛1锛媥n锛2=xn锛2路x2锛媥n锛2路3x锛媥n锛2路1 =xn锛2(x2锛3x...
