å å¼å解 3a3b2cï¼6a2b2c2ï¼9ab2c3ï¼3ab^2 c(a^2-2ac+3c^2)
3.å å¼å解xyï¼6ï¼2xï¼3yï¼(x-3)(y-2)
4.å å¼å解x2(xï¼y)ï¼y2(yï¼x)ï¼(x+y)(x-y)^2
5.å å¼å解2x2ï¼(aï¼2b)xï¼abï¼(2x-a)(x+b)
6.å å¼å解a4ï¼9a2b2ï¼a^2(a+3b)(a-3b)
7.è¥å·²ç¥x3ï¼3x2ï¼4å«æxï¼1çå å¼ï¼è¯å解x3ï¼3x2ï¼4ï¼(x-1)(x+2)^2
8.å å¼å解ab(x2ï¼y2)ï¼xy(a2ï¼b2)ï¼(ay+bx)(ax-by)
9.å å¼å解(xï¼y)(aï¼bï¼c)ï¼(xï¼y)(bï¼cï¼a)ï¼2y(a-b-c)
10.å å¼å解a2ï¼aï¼b2ï¼bï¼(a+b)(a-b-1)
11.å å¼å解(3aï¼b)2ï¼4(3aï¼b)(aï¼3b)ï¼4(aï¼3b)2ï¼[3a-b-2(a+3b)]^2=(a-7b)^2
12.å å¼å解(aï¼3)2ï¼6(aï¼3)ï¼(a+3)(a-3)
13.å å¼å解(xï¼1)2(xï¼2)ï¼(xï¼1)(xï¼2)2ï¼-(x+1)(x+2)
abcï¼abï¼4aï¼a(bc+b-4)
(2)16x2ï¼81ï¼(4x+9)(4x-9)
(3)9x2ï¼30xï¼25ï¼(3x-5)^2
(4)x2ï¼7xï¼30ï¼(x-10)(x+3)
35.å å¼å解x2ï¼25ï¼(x+5)(x-5)
36.å å¼å解x2ï¼20xï¼100ï¼(x-10)^2
37.å å¼å解x2ï¼4xï¼3ï¼(x+1)(x+3)
38.å å¼å解4x2ï¼12xï¼5ï¼(2x-1)(2x-5)
39.å å¼å解ä¸ååå¼ï¼
(1)3ax2ï¼6axï¼3ax(x-2)
(2)x(xï¼2)ï¼xï¼x(x+1)
(3)x2ï¼4xï¼axï¼4aï¼(x-4)(x-a)
(4)25x2ï¼49ï¼(5x-9)(5x+9)
(5)36x2ï¼60xï¼25ï¼(6x-5)^2
(6)4x2ï¼12xï¼9ï¼(2x+3)^2
(7)x2ï¼9xï¼18ï¼(x-3)(x-6)
(8)2x2ï¼5xï¼3ï¼(x-3)(2x+1)
(9)12x2ï¼50xï¼8ï¼2(6x-1)(x-4)
40.å å¼å解(xï¼2)(xï¼3)ï¼(xï¼2)(xï¼4)ï¼(x+2)(2x-1)
41.å å¼å解2ax2ï¼3xï¼2axï¼3ï¼ (x+1)(2ax-3)
42.å å¼å解9x2ï¼66xï¼121ï¼(3x-11)^2
43.å å¼å解8ï¼2x2ï¼2(2+x)(2-x)
44.å å¼å解x2ï¼xï¼14 ï¼æ´æ°å
æ æ³å解
45.å å¼å解9x2ï¼30xï¼25ï¼(3x-5)^2
46.å å¼å解ï¼20x2ï¼9xï¼20ï¼(-4x+5)(5x+4)
47.å å¼å解12x2ï¼29xï¼15ï¼(4x-3)(3x-5)
48.å å¼å解36x2ï¼39xï¼9ï¼3(3x+1)(4x+3)
49.å å¼å解21x2ï¼31xï¼22ï¼(21x+11)(x-2)
50.å å¼å解9x4ï¼35x2ï¼4ï¼(9x^2+1)(x+2)(x-2)
51.å å¼å解(2xï¼1)(xï¼1)ï¼(2xï¼1)(xï¼3)ï¼2(x-1)(2x+1)
52.å å¼å解2ax2ï¼3xï¼2axï¼3ï¼(x+1)(2ax-3)
53.å å¼å解x(yï¼2)ï¼xï¼yï¼1ï¼(x-1)(y+1)
54.å å¼å解(x2ï¼3x)ï¼(xï¼3)2ï¼(x-3)(2x-3)
55.å å¼å解9x2ï¼66xï¼121ï¼(3x-11)^2
56.å å¼å解8ï¼2x2ï¼2(2-x)(2+x)
57.å å¼å解x4ï¼1ï¼(x-1)(x+1)(x^2+1)
58.å å¼å解x2ï¼4xï¼xyï¼2yï¼4ï¼(x+2)(x-y+2)
59.å å¼å解4x2ï¼12xï¼5ï¼(2x-1)(2x-5)
60.å å¼å解21x2ï¼31xï¼22ï¼(21x+11)(x-2)
61.å å¼å解4x2ï¼4xyï¼y2ï¼4xï¼2yï¼3ï¼(2x+y-3)(2x+y+1)
62.å å¼å解9x5ï¼35x3ï¼4xï¼x(9x^2+1)(x+2)(x-2)
63.å å¼å解ä¸ååå¼ï¼
(1)3x2ï¼6xï¼3x(x-2)
(2)49x2ï¼25ï¼(7x+5)(7x-5)
(3)6x2ï¼13xï¼5ï¼(2x-1)(3x-5)
(4)x2ï¼2ï¼3xï¼(x-1)(x-2)
(5)12x2ï¼23xï¼24ï¼(3x-8)(4x+3)
(6)(xï¼6)(xï¼6)ï¼(xï¼6)ï¼(x-6)(x+5)
(7)3(xï¼2)(xï¼5)ï¼(xï¼2)(xï¼3)ï¼2(x-6)(x+2)
(8)9x2ï¼42xï¼49ï¼(3x+7)^2 ã
1ï¼è¥(2x)n�6�181 = (4x2+9)(2x+3)(2x�6�13)ï¼é£ä¹nçå¼æ¯( )
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3ï¼æå¤é¡¹å¼a4�6�1 2a2b2+b4å å¼å解çç»æ为( )
Aï¼a2(a2�6�12b2)+b4 Bï¼(a2�6�1b2)2
Cï¼(a�6�1b)4 Dï¼(a+b)2(a�6�1b)2
4ï¼æ(a+b)2�6�14(a2�6�1b2)+4(a�6�1b)2å解å å¼ä¸º( )
Aï¼( 3a�6�1b)2 Bï¼(3b+a)2
Cï¼(3b�6�1a)2 Dï¼( 3a+b)2
5ï¼è®¡ç®ï¼(�6�1)2001+(�6�1)2000çç»æ为( )
Aï¼(�6�1)2003 Bï¼�6�1(�6�1)2001
Cï¼ Dï¼�6�1
6ï¼å·²ç¥xï¼y为任ææçæ°ï¼è®°M = x2+y2ï¼N = 2xyï¼åMä¸Nç大å°å
³ç³»ä¸º( )
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7ï¼å¯¹äºä»»ä½æ´æ°mï¼å¤é¡¹å¼( 4m+5)2�6�19é½è½( )
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Cï¼è¢«(m�6�11)æ´é¤ Dï¼è¢«(2n�6�11)æ´é¤
8ï¼å°�6�13x2n�6�16xnå解å å¼ï¼ç»ææ¯( )
A�6�13xn(xn+2) B�6�13(x2n+2xn)
Cï¼�6�13xn(x2+2) Dï¼3(�6�1x2n�6�12xn)
9ï¼ä¸ååå½¢ä¸ï¼æ¯æ£ç¡®çå å¼å解çæ¯( )
Aï¼ 0.09m2�6�1 n2 = ( 0.03m+ )( 0.03m�6�1)
Bï¼x2�6�110 = x2�6�19�6�11 = (x+3)(x�6�13)�6�11
Cï¼x4�6�1x2 = (x2+x)(x2�6�1x)
Dï¼(x+a)2�6�1(x�6�1a)2 = 4ax
10ï¼å¤é¡¹å¼(x+y�6�1z)(x�6�1y+z)�6�1(y+z�6�1x)(z�6�1x�6�1y)çå
¬å å¼æ¯( )
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11ï¼å·²ç¥x为任ææçæ°ï¼åå¤é¡¹å¼x�6�11�6�1x2çå¼( )
Aï¼ä¸å®ä¸ºè´æ°
Bï¼ä¸å¯è½ä¸ºæ£æ°
Cï¼ä¸å®ä¸ºæ£æ°
Dï¼å¯è½ä¸ºæ£æ°æè´æ°æé¶
äºã解çé¢ï¼
å解å å¼ï¼
(1)(ab+b)2�6�1(a+b)2
(2)(a2�6�1x2)2�6�14ax(x�6�1a)2
(3)7xn+1�6�114xn+7xn�6�11(n为ä¸å°äº1çæ´æ°)
çæ¡ï¼
ä¸ãéæ©é¢ï¼
1ï¼B 说æï¼å³è¾¹è¿è¡æ´å¼ä¹æ³åå¾16x4�6�181 = (2x)4�6�181ï¼æ以nåºä¸º4ï¼çæ¡ä¸ºBï¼
2ï¼B 说æï¼å 为9x2�6�112xy+mæ¯ä¸¤æ°åçå¹³æ¹å¼ï¼æ以å¯è®¾9x2�6�112xy+m = (ax+by)2ï¼åæ9x2�6�112xy+m = a2x2+2abxy+b2y2ï¼å³a2 = 9ï¼2ab = �6�112ï¼b2y2 = mï¼å¾å°a = 3ï¼b = �6�12ï¼æa = �6�13ï¼b = 2ï¼æ¤æ¶b2 = 4ï¼å æ¤ï¼m = b2y2 = 4y2ï¼çæ¡ä¸ºBï¼
3ï¼D 说æï¼å
è¿ç¨å®å
¨å¹³æ¹å
¬å¼ï¼a4�6�1 2a2b2+b4 = (a2�6�1b2)2ï¼åè¿ç¨ä¸¤æ°åçå¹³æ¹å
¬å¼ï¼ä¸¤æ°åå«æ¯a2ã�6�1b2ï¼åæ(a2�6�1b2)2 = (a+b)2(a�6�1b)2ï¼å¨è¿éï¼æ³¨æå å¼å解è¦å解å°ä¸è½å解为æ¢ï¼çæ¡ä¸ºDï¼
4ï¼C 说æï¼(a+b)2�6�14(a2�6�1b2)+4(a�6�1b)2 = (a+b)2�6�12(a+b)[2(a�6�1b)]+[2(a�6�1b)]2 = [a+b�6�12(a�6�1b)]2 = (3b�6�1a)2ï¼æ以çæ¡ä¸ºCï¼
5ï¼B 说æï¼(�6�1)2001+(�6�1)2000 = (�6�1)2000[(�6�1)+1] = ()2000 �6�1= ()2001 = �6�1(�6�1)2001ï¼æ以çæ¡ä¸ºBï¼
6ï¼B 说æï¼å 为M�6�1N = x2+y2�6�12xy = (x�6�1y)2â¥0ï¼æ以Mâ¥Nï¼
7ï¼A 说æï¼( 4m+5)2�6�19 = ( 4m+5+3)( 4m+5�6�13) = ( 4m+8)( 4m+2) = 8(m+2)( 2m+1)ï¼
8ï¼A
9ï¼D 说æï¼é项Aï¼0.09 = 0.32ï¼å 0.09m2�6�1 n2 = ( 0.3m+n)( 0.3m�6�1n)ï¼æ以Aéï¼é项Bçå³è¾¹ä¸æ¯ä¹ç§¯çå½¢å¼ï¼é项Cå³è¾¹(x2+x)(x2�6�1x)å¯ç»§ç»å解为x2(x+1)(x�6�11)ï¼æ以çæ¡ä¸ºDï¼
10ï¼A 说æï¼æ¬é¢çå
³é®æ¯ç¬¦å·çååï¼z�6�1x�6�1y = �6�1(x+y�6�1z)ï¼èx�6�1y+zâ y+z�6�1xï¼åæ¶x�6�1y+zâ �6�1(y+z�6�1x)ï¼æ以å
¬å å¼ä¸ºx+y�6�1zï¼
11ï¼B 说æï¼x�6�11�6�1x2 = �6�1(1�6�1x+x2) = �6�1(1�6�1x)2â¤0ï¼å³å¤é¡¹å¼x�6�11�6�1x2çå¼ä¸ºéæ£æ°ï¼æ£ç¡®çæ¡åºè¯¥æ¯Bï¼
äºã解çé¢ï¼
(1) çæ¡ï¼a(b�6�11)(ab+2b+a)
说æï¼(ab+b)2�6�1(a+b)2 = (ab+b+a+b)(ab+b�6�1a�6�1b) = (ab+2b+a)(ab�6�1a) = a(b�6�11)(ab+2b+a)ï¼
(2) çæ¡ï¼(x�6�1a)4
说æï¼(a2�6�1x2)2�6�14ax(x�6�1a)2
= [(a+x)(a�6�1x)]2�6�14ax(x�6�1a)2
= (a+x)2(a�6�1x)2�6�14ax(x�6�1a)2
= (x�6�1a)2[(a+x)2�6�14ax]
= (x�6�1a)2(a2+2ax+x2�6�14ax)
= (x�6�1a)2(x�6�1a)2 = (x�6�1a)4ï¼
(3) çæ¡ï¼7xn�6�11(x�6�11)2
说æï¼åå¼ = 7xn�6�11 �6�1x2�6�17xn�6�11 �6�12x+7xn�6�11 = 7xn�6�11(x2�6�12x+1) = 7xn�6�11(x�6�11)2
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