1、整式乘法和因式分解练习题1.因式分解: (1)a(x-y)-b(y-x) (2)4a3b-16ab3 (3)-4a3+8a2-4a (4)(x2+2x)2-(2x+4)22.先化简,再求值(x+2)2-(x+1)(x-2),其中x=-23.先化简,再求值:(2a+b)2-a(4a+3b),其中a=1,b=4.不用计算器计算:2(3+1)(32+1)(34+1)(38+1)(316+1)(332+1)-3645.计算 (1)(-54x2y-108xy2+36xy)(18xy) (2)(2x+3y)(3y-2x)-(x-3y)(y+3x)6.因式分解 (1)4a2-25b2 (2)-3x3y2+6
2、x2y3-3xy4 (3)3x(a-b)-6y(b-a) (4)(x2+4)2-16x27.已知:x+y=6,xy=4,求下列各式的值 (1)x2+y2 (2)(x-y)28.计算与化简 (1)(-2ab)+(-a2b)+5ab-a2b; (2)计算:(-)-2016; (3)运用乘法公式计算:1232-122124; (4)(x-y+3)(x-y-3); (5)先化简,再求值:(-m3n4+m2n3)(-mn2),其中m=-2,n=9.因式分解 (1)a2(x+y)-b2(x+y) (2)x4-8x2+1610.计算: (1)a2(a-1)+(a-5)(a+7); (2)(x-5y)2-(x
3、+5y)211.计算: (1)(4ab3-8a2b2)(4ab)+(2a+b)(2a-b) (2)先化简,再求值:(x+5)(x-1)+(x-3)2其中x=-212.分解因式: (1)(a2+1)2-4a2 (2)-ax2-a+xa (3)6(x-y)2-12(y-x)3 (4)x2(x-2)+4(2-x)(5)(x+3y)2+(2x+6y)(3y-4x)+(4x-3y)213.计算 (1)(2x+3y)(4x+7y); (2)(-3a+2b)(-3a-2b); (3)(-3x+2)2; (4)-3101(-)100-(-3)0+(-)214. 因式分解: (1)2x2y-4xy+2y (2)
4、x4-9x2(3)2x2y-4xy+2y (4)4a4-64(5)6m3-16m2+2m (6)x2-25y2 15. 计算:(1)-4a3b2(2a4b2-ab3+3) (2)(x+3)(x-3)-(x-2)2 (3)(m-2n+3)(m+2n+3)17.分解因式: (1)-9x3+81x (2)(a2+b2)2-4a2b2(3)x3-6x2+9x (4)(p-4)(p+1)+3p(5)3a2b-2ab2+3ab (6)(2a+b)2-4b2 19.先化简,再求值: (1)(a+2)2-(1-a)(-a-1),其中a= (2)2(x-1)(x-2)-x(2x+3)其中x=20.因式分解 (1)9x2-81 (2)(x2+y2)2-4x2y2 (3)3x(a-b)-6y(b-a) (4)6mn2-9m2n-n3(5)3x(a-b)-6y(b-a) (6)4x2-64 (7)(x2+4)2-16x2 (8)3x2-12xy+12y2; 23.因式分解: (1)4a2-2a (2)-2xy-x2-y2 (3)49(m-n)2-9(m+n)2 (4)(x-3)(x+1)+424.计算 (1)4x2y(3xy2z-7xz) (2)(x-y)2-(2x+y)225.因式分解: (1)2a2-8 (2)4ab2-4a2b-b37 / 7