1、 (4)2x3+2x26x;(5)7x2+7x+14; (6)12a2b+24ab2;(7) xyx2y2x3y3; (8)27x3+9x2y.例2:【培优题型一】(1)a(x3)+2b(x3);(2)4(x+y)3-6(x+y)2【巩固练习】:(1) x(a+b)+y(a+b) (2)3a(xy)(xy)(3)6(p+q)212(q+p) (4)8(a-b)4+12(a-b)5例3:【培优题型二】(1)2a=_(a2); (2)yx=_(xy);(3)b+a=_(a+b); (4)(ba)2=_(ab)2; (1) a(xy)+b(yx); (2)6(mn)312(nm)2.(3)a(m2)
2、+b(2m) (4)2(yx)2+3(xy) (5)mn(mn)m(nm)2 (6)1.5(xy)3+10(yx)2 (7)m(mn)(pq)n(nm)(pq) (8)(ba)2+a(ab)+b(ba)平方差公式法平方差公式:a2b2=(a+b)(a-b)把下列各式分解因式:(1)x216; (2)9 m 24n2; (3)9a2b2.(1) a2b2m2 (2)2516x2;(3)a281 (4)36x2 (5)116b2 (6)m 29n2 (7)0.25q2121p2 (8)169x24y2(1)(m+n)2(mn)2; (2)16(a+b)2-9(a-b)2(1)(m+n)2n2 (2
3、)49(ab)216(a+b)2(3)(2x+y)2(x+2y)2 (4)(x2+y2)2x2y2(5)(2mn)2(m2n)2; (6)9a2p2b2q2 (7)a2x2y2 (8)(m+n)2n2 (9)(2x+y)2(x+2y)2 (10)p41(1)2x38x.(2)3ax23ay4(3)-6xy3+24x3y(4)(x1)+b2(1x)完全平方式(1) x2+2x+1; (2)4a2-12a+9 (3)x2x+ (1) x2x+1 (2)m2+3 m n+9n2 (3)x212xy+36y2(4)16a4+24a2b2+9b4 (5)2xyx2y2 (1)(m+n)26(m +n)+
4、9.(2)4(a-b)2+4(a-b)+1(1)3ax2+6axy+3ay2; (2)x24y2+4xy.(3)412(xy)+9(xy)2(4)(x+y)2+6(x+y)+9 (5)a22a(b+c)+(b+c)2(1)12xy+ x2y2; (2)12t+9+4t2;(1)+y2+y; (2)25m280 m +64;(3)+xy+y2; (4)a2b24ab+4;(5)4xy24x2yy3 (6)a+2a2a3(7) (8)4x2y24xy1因式分解综合题(一)(1)一提:如果多项式的各项有公因式,那么先提公因式;(2)二用:如果各项没有公因式,那么可以尝试运用公式来分解;(3)三查:分
5、解因式,必须进行到每一个多项式因式都不能再分解为止(1) (2)(3) (4) (5) (6) (7) (8)a24ab4b2= (9) (10)(11)3ay3by(12)a214a49(13)n2m2 (14)20a3x45ay2x (15)16a29b2 (16)4x212x9 (17)4x38x24x (18)3m(ab)318n(ba)3(19)(mn)2(mn)2 (20)(x21)24x2 因式分解综合题(二)x24x4_m22m_x2y9y_x216_xy24x_a34a_x44_ x24xy4y2_a2a_2a38a_ax22axyay2_(xy)23(xy)_x2x_ _2x212x18 _x32x2x_ax2ax2a_3x36x2y3xy2_2x28x8_ x32x2yxy2_a22a1_2x2xyx_xy22xy3y_x(xy)y(xy) _x29_x2x_ax2ay2_x22x1_m34m_27x218x3_9x2y24y4_x44_x2y4y_ _x32x2x_a2ab_4a21_a24a4_ax2ay2_2a28_x3yxy_2a24ab2b2 _2a24a2_mx26mx9m_2mx24mx2m_x(xy)(xy)x(xy)2_
copyright@ 2008-2022 冰豆网网站版权所有
经营许可证编号:鄂ICP备2022015515号-1