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)
把下列各式分解因式1mxynyx
1 m x y n baiy x dum n zhix y dao2 2x4 32 2 回x4 16 2 x2 2 42 2 x2 4 答x2 4 2 x2 4 x 2 x 2 3 a3 a a a2 1 a a 1 a 1 4 x y 2 2 x y 1 x y 1 2 5 11 x x 1 x ...
把下列各式分解因式(1)9a2 14b2(3)12a2 a
1 9a2 1 4b2 3a 1 2b 3a 1 2b 3 12a ab 12b 12 a2 2ab b2 1 2 a b 2 3 a2 2ab 4 b2 a b 2 4 a b 2 a b 2 4 x x2 1 2 4x3 x x2 1 2 4x2 x x2 1 2x x2 1 2x x x 1 ...
把下列各式因式分解 (1)ax2 16ay2(2) 2a
1 ax2 16ay2 a x 4y duzhix 4y dao 專2 2a3 12a2 18a 2a 屬a2 6a 9 2a a 3 2 3 a2 2ab b2 1 a b 2 1 a b 1 a b 1 4 a2 x y 4b2 x y x y a2 4b2 x y a 2b a 2b 5 x ...