50道因式分解初一的最后难一点
以下应该够用的了!1.(3a－b)2－4(3a－b)(a＋3b)＋4(a＋3b)2＝[3a-b-2(a+3b)]^2=(a-7b)^2
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 .
绛旓細浠ヤ笅搴旇澶熺敤鐨勪簡!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...
绛旓細01銆¼x²-2+4/x²;02銆乤²+b²+c²+2ab-2ac-2bc 03銆3x²-147 04銆亁³-27 05銆3x³+192 06銆亁⁴+6x²+9 07銆7x²-28|x|+28 08銆3x²-15 09銆亁+2+鈭(x+1)10銆亁+½-鈭(x²+x-2)0...
绛旓細.鍒嗚В鍥犲紡:(1)a鐨勪簩娆℃柟+14ab+45b鐨勪簩娆℃柟(2)a鐨勪簩娆℃柟-9ab+20b鐨勪簩娆℃柟 .鍒嗚В鍥犲紡:a鐨勫洓娆℃柟-5a鐨勪簩娆℃柟+4 .鍒嗚В鍥犲紡:2a+4+3ab+6b 17銆佲7x2y3+42x3y2鈥14x3y3 18銆亁2锛坸鈥攜锛夆3xy锛坹鈥攛锛 19銆乤4鈥2a2b2+b4 20銆 鈥4b2 21銆9锛坢+2n锛2鈥4锛坢鈥攏锛2...
绛旓細2. 5xn+1锛15xn锛60xn--1銆3. (a+b)2x2-2(a2-b2)xy+(a-b)2y2 4. x4-1 5.锛峚2锛峛2锛2ab锛4鍒嗚В鍥犲紡 6.a2+b2+c2+2ab+2bc+2ac 7.x2-2x-8 8锛3x2+5x-2 9. (x+1)(x+2)(x+3)(x+4)+1 10. (x2+3x+2)(x2+7x+12)-120.11锛庢妸澶氶」寮3x2+11x+10鍒嗚В鍥...
绛旓細50閬撳洜寮忓垎瑙鍜岀瓟妗 2.3a3b2c锛6a2b2c2锛9ab2c3锛3ab^2 c(a^2-2ac+3c^2)3.鍥犲紡鍒嗚Вxy锛6锛2x锛3y锛(x-3)(y-2)4.鍥犲紡鍒嗚Вx2(x锛峺)锛媦2(y锛峹)锛(x+y)(x-y)^2 5.鍥犲紡鍒嗚В2x2锛(a锛2b)x锛峚b锛(2x-a)(x+b)6.鍥犲紡鍒嗚Вa4锛9a2b2锛漚^2(a+3b)(a-3b)7.鑻ュ凡鐭3...
绛旓細16,x^+32x-33 =(x+33)(x-1)17,x^-21x-100=(x-25)(x+4)18,x^+4x+3=(x+3)(x+1)19,x^-6x+5=(x-5)(x-1)20,x^+15x+26=(x+2)(x+13)21,x^-15x+26=(x-2)(x-13)22,x^-25x+26=娌℃硶鍒嗚В銆23,x^-25x-26=(x-26)(x+1)24,x^+5x-6=(x+6)(x-1)...
绛旓細x^2-13xy锛36y^2 =(x-4y)(x-9y)( x^2锛4)-16x^2 =4-15x^2 =(2+ 鈭15 x)(2- 鈭 15 x)( x^2-5)^2锛8(x^2-5)=(x^2 -5)(x^2 +3)(x-1)(x-2)-2(2-x)^2 =(x-2)(x-1-2x+4)=(x-2)(3-x)72^2锛72*28锛28^2 =(72+28)^2-72*28 =10000-...
绛旓細50.鍥犲紡鍒嗚В9x4锛35x2锛4锛 銆 51.鍥犲紡鍒嗚В(2x锛1)(x锛1)锛(2x锛1)(x锛3)锛濄 52.鍥犲紡鍒嗚В2ax2锛3x锛2ax锛3锛 銆 53.鍥犲紡鍒嗚Вx(y锛2)锛峹锛峺锛1锛 銆 54.鍥犲紡鍒嗚В(x2锛3x)锛(x锛3)2锛 銆 55.鍥犲紡鍒嗚В9x2锛66x锛121锛 銆 56.鍥犲紡鍒嗚В8锛2x2锛 銆 57.鍥犲紡...
绛旓細鐐硅瘎锛氭渚嬩腑鐨勯鏄槗閿欑殑鍏稿瀷棰橈紝鍒濆鏃堕毦浜庨伩鍏嶏紝涓昏鍘熷洜鏄鍗佸瓧鐩镐箻鐨勫師鍒欐病鏈夊厖鍒嗚璇嗭紝鍗筹紝涓ゅ父鏁伴」鐨勪箻绉槸鍘熷椤瑰紡鐨勫父鏁伴」锛屽畠浠殑鍜屾槸鍘熶竴娆￠」绯绘暟锛屽洜姝ゅ崟绾殑鍑戞暟鏄笉琛岀殑锛屼竴瀹氭敞鎰忓垎瑙ｅ悗涓庡師澶氶」寮忕浉绛.鍗佸瓧鐩镐箻娉曗斺斿熷姪鐢诲崄瀛椾氦鍙夌嚎鍒嗚В绯绘暟锛屼粠鑰屾妸浜屾涓夐」寮鍒嗚В鍥犲紡鐨鏂规硶鍙仛鍗佸瓧...
绛旓細5,X^-21X+20 =(x-20)(x-1)6,X^-19X-20 =(x-20)(x+1)7,X^+14X+33 =(x+3)(x+11)8,X^+16X+48 =(x+4)(x+12)9,X^-13X-48 =(x-16)(x+3)10,X^-8X-48 =(x-12)(x+4)11,X^-49X+48 =(x-48)(x-1)12,X^+14X+48 =(x+6)(x+8)13,X^+34X+33 ...
