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1、用公式法进行因式分解一、填空题(本大题共20小题,共60.0分)1.分解因式:xy2+8xy+16x= _ 2.因式分解:4m2-36= _ 3.因式分解:2a3-8ab2= _ 4.将多项式mn2+2mn+m因式分解的结果是 _ 5.把多项式4ax2-9ay2分解因式的结果是 _ 6.因式分解:2x2-32x4= _ 7.因式分解:a2b-4ab+4b= _ 8.分解因式:mx2-4m= _ 9.分解因式a2b-a的结果为 _ 10.分解因式:2ax2-8a= _ 11.分解因式:2m2-8= _ 12.分解因式:ma2+2mab+mb2= _ 13.分解因式:a2b-b3= _ 14.分解
2、因式:x(x-1)-y(y-1)= _ 15.分解因式:ax3y-axy= _ 16.因式分解:3y2-12= _ 17.因式分解:m2n-6mn+9n= _ 18.因式分解:a2b-ab+b= _ 19.分解因式-a3+2a2b-ab2= _ 20.分解因式:a2b+4ab+4b= _ 二、计算题(本大题共30小题,共180.0分)21.分解因式 (1)a2(a-b)+4b2(b-a) (2)m4-1 (3)-3a+12a2-12a3 22.把下列多项式分解因式: (1)6x2y-9xy; (2)4a2-1; (3)n2(n-6)+9n 23.把下列各式因式分解 (1)ap-aq+am (2
3、)a2-4 (3)a2-2a+1 (4)ax2+2axy+ay2 24.分解因式: (1)x+xy+xy2 (2)(m+n)3-4(m+n) 25.因式分解: (1)x(x-2)-3(2-x) (2)x2-10x+25 26.把下列各式进行因式分解: (1)a3-6a2+5a; (2)(x2+x)2-(x+1)2; (3)4x2-16xy+16y2 27.因式分解: (1)x2-y2 (2)-4a2b+4ab2-b3 28.分解因式 (1)x3-16x (2)8a2-8a+2 29.分解因式: (1)3m4-48; (2)b4-4ab3+4ab2 30.分解因式: (1)2x2-4x (2)a
4、2(x-y)-9b2(x-y) (3)4ab2-4a2b-b3 (4)(y2-1)2+6(1-y2)+9 31.分解因式: (1)3a2+6ab+3b2 (2)9(m+n)2-(m-n)2 32.因式分解: (1)a(x-y)-b(y-x) (2)3ax2-12ay2 (3)(x+y)2+4(x+y+1) 33.分解因式: (1)a(x-y)-b(y-x); (2)16x2-64; (3)(x2+y2)2-4x2y2 34.分解因式 (1)4x3y-xy3 (2)-x2+4xy-4y2 35.分解下列因式: (1)9a2-1 (2)p3-16p2+64p 36.因式分解: (1)x2-10xy
5、+25y2 (2)3a2-12ab+12b2 (3)(x2+y2)2-4x2y2 (4)9x4-81y4 37.将下列各式分解因式 (1)16a2b2-1 (2)12ab-6(a2+b2) 38.把下列各式因式分解 (1)4a2-16 (2)(x2+4)2-16x2 39.把下列多项式因式分解: (1)x3y-2x2y+xy; (2)9a2(x-y)+4b2(y-x) 40.分解因式 (1)x3-xy2 (2)(x+2)(x+4)+1 41.因式分解:-3a3b+6a2b2-3ab3 42.把下列各式分解因式: 4m(x-y)-n(x-y); 2t2-50; (x2+y2)2-4x2y2 43
6、.因式分解 (1)x2-5x-6 (2)2ma2-8mb2 (3)a3-6a2b+9ab2 44.分解因式:2x2-12x+18 45.分解因式: (1)x3+2x2+x (2)x3y3-xy 46.因式分解: (1)ax2-2ax+a (2)24(a-b)2-8(b-a) 47.因式分解: (1)4x2-16y2 (2)x2-10x+25 48.分解因式 (1)m(a-3)+2(3-a) (2)x2-6x+9 49.因式分解:6xy2-9x2y-y2 50.分解因式 (1)x2(a+b)-a-b (2)a3b-2a2b2+ab3 (3)y4-3y3-4y2 (4)-(a2+2)2+6(a2+
7、2)-9 用公式法进行因式分解答案和解析【答案】 1.x(y+4)2 2.4(m+3)(m-3) 3.2a(a+2b)(a-2b) 4.m(n+1)2 5.a(2x+3y)(2x-3y) 6.2x2(1+4x)(1-4x) 7.b(a-2)2 8.m(x+2)(x-2) 9.a(ab-1) 10.2a(x+2)(x-2) 11.2(m+2)(m-2) 12.m(a+b)2 13.b(a+b)(a-b) 14.(x-y)(x+y-1) 15.axy(x+)(x-) 16.3(y+2)(y-2) 17.n(m-3)2 18.b(a-)2 19.-a(a-b)2 20.b(a+2)2 21.解:(1
8、)原式=a2(a-b)-4b2(a-b)=(a-b)(a2-4b2)=(a-b)(a+2b)(a-2b); (2)原式=(m2+1)(m2-1)=(m2+1)(m+1)(m-1); (3)原式=-3a(4a2-4a+1)=-3a(2a-1)2 22.解:(1)原式=3xy(2x-3); (2)原式=(2a+1)(2a-1); (3)原式=n(n2-6n+9)=n(n-3)2 23.解:(1)原式=a(p-q+m); (2)原式=(a+2)(a-2); (3)原式=(a-1)2; (4)原式=a(x2+2xy+y2)=a(x+y)2 24.解:(1)原式=x(1+4y+4y2)=x(1+2y)2
9、; (2)原式=(m+n)(m+n)2-4=(m+n)(m+n+2)(m+n-2) 25.解:(1)原式=x(x-2)+3(x-2)=(x-2)(x+3); (2)原式=(x-5)2 26.解:(1)原式=a(a2-6a+5)=a(a-1)(a-5); (2)原式=(x2+x+x+1)(x2+x-x-1)=(x+1)2(x+1)(x-1); (3)原式=4(x2-4xy+4y2)=4(x-2y)2 27.解:(1)原式=(x+y)(x-y); (2)原式=-b(4a2-4ab+b2)=-b(2a-b)2 28.解:(1)原式=x(x2-16)=x(x+4)(x-4); (2)原式=2(4a2-
10、4a+1)=2(2a-1)2 29.解:(1)原式=3(m4-16)=3(m2+4)(m+2)(m-2); (2)原式=b2(b2-4ab+4a) 30.解:(1)原式=2x(x-2); (2)原式=(x-y)(a2-9b2)=(x-y)(a+3b)(a-3b); (3)原式=-b(b2-4ab+4a2)=-b(2a-b)2; (4)原式=(y2-1)2-6(y2-1)+9=(y2-4)2=(y+2)2(y-2)2 31.解:(1)原式=3(a2+2ab+b2)=3(a+b)2; (2)原式=3(m+n)+m-n3(m+n)-(m-n)=(4m+2n)(2m+4n)=4(2m+n)(m+2n)
11、 32.解:(1)原式=a(x-y)+b(x-y)=(x-y)(a+b); (2)原式=3a(x2-4y2)=3a(x+2y)(x-2y); (3)原式=(x+y)2+4(x+y)+4=(x+y+2)2 33.解:(1)原式=a(x-y)+b(x-y)=(x-y)(a+b); (2)原式=16(x2-4)=16(x+2)(x-2); (3)原式=(x2+y2+2xy)(x2+y2-2xy)=(x+y)2(x-y)2 34.解:(1)原式=4xy(x2-y2)=4xy(x+y)(x-y); (2)原式=-(x2-4xy+4y2)=-(x-2y)2 35.解:(1)原式=(3a+1)(3a-1);
12、 (2)原式=p(p2-16p+64)=p(p-8)2 36.解:(1)原式=(x-5y)2; (2)原式=3(a2-4ab+4b2)=3(a-2b)2; (3)原式=(x2+y2+2xy)(x2+y2-2xy)=(x+y)2(x-y)2; (4)原式=9(a2+3y2)(x2-3y2) 37.解:(1)原式=(4ab+1)(4ab-1); (2)原式=-6(a2-2ab+b2)=-6(a-b)2 38.解:(1)原式=4(a2-4)=4(a+2)(a-2); (2)原式=(x2+4+4x)(x2+4-4x)=(x-2)2(x+2)2 39.解:(1)原式=xy(x2-2x+1)=xy(x-1
13、)2; (2)原式=9a2(x-y)-4b2(x-y)=(x-y)(3a+2b)(3a-2b) 40.解:(1)原式=x(x2-y2)=x(x+y)(x-y); (2)原式=(x+3)2 41.解:原式=-3ab(a2-2ab+b2)=-3ab(a-b)2 42.解:4m(x-y)-n(x-y)=(x-y)(4m-n); 2t2-50=2(t2-25)=2(t+5)(t-5); (x2+y2)2-4x2y2=(x2+y2+2xy)(x2+y2-2xy)=(x+y)2(x-y)2 43.解:(1)原式=(x-6)(x+1); (2)原式=2m(a2-4b2)=2m(a+2b)(a-2b); (3
14、)原式=a(a2-6ab+9b2)=a(a-3b)2 44.解:原式=2(x2-6x+9) =2(x-3)2 45.解:(1)原式=x(x2+2x+1)=x(x+1)2; (2)原式=xy(x2y2-1)=xy(xy+1)(xy-1) 46.解:(1)原式=a(x2-2x+1)=a(x-1)2; (2)原式=24(a-b)2+8(a-b)=8(a-b)3(a-b)+1=8(a-b)(3a-3b+1) 47.解:(1)原式=(2x+4y)(2x-4y); (2)原式=(x-5)2 48.解:(1)原式=m(a-3)-2(a-3)=(a-3)(m-2); (2)原式=(x-3)2 49.解:原式=-y(9x2-6xy+y) 50.解:(1)原式=x2(a+b)-(a+b)=(a+b)(x2-1)=(a+b)(x+1)(x-1); (2)原式=ab(a2-2ab+b2)=ab(a-b)2; (3)原式=y2(y2-3y-4)=y2(y-4)(y+1); (4)原式=-(a2+2)-32=-(a-1)2(a+1)2