把下列各式分解因式14a2bc8ab32b

2021-05-24 00:18:52 字數 1944 閱讀 8624

1樓:s度過地區

(zhi1)4a2bc-8ab+32b2=4b(daoa2c-2a+8b);版

(2)x(a-b)(

權b-c)-y(b-a)(b-c),

=x(a-b)(b-c)+y(a-b)(b-c),=(a-b)(b-c)(x+y);

(3)x4-81,

=(x2+9)(x2-9),

=(x2+9)(x+3)(x-3);

(4)a

4-ab+b2=(a

2-b)2;

(5)2x3-18xy2,

=2x(x2-9y2),

=2x(x+3y)(x-3y);

(6)-y3-1

4y+y2,

=-y(y2-y+14),

=-y(y-1

2)2.

分解因式(1)x3-4x(2)4a2-36ab+81b2(3)(a2+ab+b2)2-9a2b2(4)已知2x?y=15,xy=5,求4x3y-4x2y2

2樓:七宗罪

解答:(5』×4)

解:(1)原式

=x(x2-4)(2分)

=x(x-2)(x+2);(3分)

(2)原式=(2a)2-2?2a?9b+(9b)2(2分)=(2a-9b)2(3分);

(3)原式=(a2+ab+b2)2-(3ab)2=(a2+ab+b2+3ab)(a2+ab+b2-3ab)=(a2+4ab+b2)(a2-2ab+b2)=(a2+4ab+b2)(a-b)2;

(4)原式=xy(4x2-4xy+y2)(1分)=xy(2x-y)2(2分)

當xy=5,2x-y=1

2時,原式=5×1

25=1

5.(2分)

求答案1.把下列各式分解因式: (1)7(a-1)+x(a-1)(2)3(a-b)2+6(b-a) (3)2(m-n)2 - m(m-n

3樓:清靈風烈焰火

(1)7(a-1)+x(a-1)=(a-1)(x+7)

(2)3(a-b)2+6(b-a) =(a-b)(3a-3b-6)=3(a-b)(a-b-2)

(3)2(m-n)2 - m(m-n)=(m-n)(2m-2n-m)=(m-n)(m-2n)

(4)x(x-y)2 - y(y-x)2= (x-y)2(x-y)=(x-y)3

(5)m(a2+b2)+n(a2+b2)=(a2+b2)(m+n)

(6)18(a-b)三次方-12b(b-a)=6(a-b)[3(a-b)2+2b]=6(a-b)(3a2-6ab+3b2+2b)

(7)(2a+b)(2a-3b)-3a(2a+b)=(2a+b)(2a-3b-3a)=-(2a+b)(a+3b)

(8)x(x+y)(x-y)-x(x+y)2=-2xy(x+y)

4樓:匿名使用者

(1)(7+x)(a-1) (2)=(a-b)(a-b-6) (3) (m-n)(2m-2n-m)=(m-n)(m-2n) (4)(x-y)平方

(x-y) (5)(a平方+b平方)(m+n) (6)(a-b)=(a平方-2ab+b平方+12b)(a-b) (7)(2a+b)(2a-3b-3a)=(2a+b)(-a-3b) (8)x(x+y)(x-y-x-y)=-2xy(x+y)

5樓:希7惜

x(x-y)2 - y(y-x)2

=x(x-y)2 - y(x-y)2

=(x-y)3

6樓:匿名使用者

1.(a-1)(7+x) 2. 3(a-b)(a+b-2) 3. (m-n)(m+2n) 4. (x-y)的3次方 5.(a2+b2)(m+n)

6.(a-b)(18 a2+18ab+18b2+12b ) 7.-(2a+b)(a+3b) 8.-2xy(x+y)

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