八年级数学下----因式分解计算训练
一、提公因式法(1)8x -72 (2)a 2b -5ab (3)4m 3-6m 2
(4)a2b -5ab+9b (5)-a 2+ab-ac (6)-2x 3+4x2-2x
(7)8m 2n+2mn (8)a 2x 2y -axy 2 (9)3x 3-3x 2-9x
(10)-24x 2y -12xy 2+28y3 (11)2x 2-4x (12)-3ma 3+6ma2-12ma
(13)-2x 2-12xy 2+8xy3 (14)4a 2b 2-3ab 2+8ab 3c (15)-10x 3y 2z 3-35xy 3z 2+15x 2yz
(16)-4a 3b 3+6a2b -2ab (17)3ax 2-a 2x +ax (18)-15x 4y -20x 3y 3+5x 2y 3
(19) -x 2y +xy 2-xy (20)5(x -2) 2+a (2-x ) (11)-1x 2+2xy -xz 2
(22)7(2x -3y ) 2-14(2x -3y ) 3+21(2x -3y ) 5(23)1.21×13+1.21×9-12×1.21
(24)2.34×13.2+0.66×13.2 (25)2. 1⨯3. 14-4⨯3. 14+0. 7⨯3. 14 5
(26)9×10100-10101(27)4.3×201.2+7.5×201.2-1.8×201.2
(28)32004-32003; (29)(-2)101+(-2)100.
二.运用平方差公式因式分解
(1)x 2-y 2(2)-x 2+y2(3)64-a 2(4)4x 2-9y 2
42(5)36-25x (6) 16a -9b (7)9-0.01n 2(8)(x+p) 2-(x+q) 222
(9)4a 2-16 (10)a 5-a 3 (11)x 4-y 4 (12)12x 2-3y 2
2322-1+16x a b -4a b (16)(2x +y )-(x +2y )0. 49p -144(14) (15)(13)222
(17)32a 3-50ab 2(1) 4x 2-9y 2(2) 0. 81a 2-16b 2(20)7582-2582
44422(3) m 2-0. 012(22)-(b -c )+4a (23)1-16a b (24)1. 42⨯9-2. 32⨯36 9
(25)16(m-n) 2-9(m+n) 2(26)9x 2-(x-2y) 2(27)(3m +2n )2-(m -n )2
(28)4z 2-(x +y ) (29)4(x -y )2-25(x +y )2(30)(a +b +c )2-(a +b -c )2 2
三、运用完全平方公式-分解因式.
(1)a 2+8a +16;(2)(a +2b ) 2+6(a +2b ) +9;(3)x 2+2xy +2y 2
(4)x 2+6x +9;(5)4x 2-20x +25;(6)-4mn -4m 2-n 2
(7)a 2b 2-8abc +16c 2;(8)4a 2+2ab +b 2;(9)a 2x 2+16ax +64
(10)a 2b 2-2ab+1; (11) 9-12a+4a2; (12)x 2+
(13)(a+b)2+6(a+b)+9; (14)x 4y 4-8x 2y 2+16..
(16)a 2+10a+25 (17) m2-12mn+36n2(18)xy 3-2x 2y 2+x3y
(19)(x+2y)2-2(x+2y)+1 (15)(x+y)2-4(x+y-1)
四、十字相乘法分解因式专题练习(基础部分)
222(1)x +3x -4 (2)x -3x -4 (3)x +8x -20 121444x+. 39
(4)x 2-5x -24 (5)x 2+12x +27 (6)x 2-8x +12
(7)y 2-15y +36 (8)m 2+10m -24 (9)m 2+10m +24
(10)y 2+13y +36 (11)x 2+7xy -18y 2 (12)x 2-3xy -18y 2
22222-m -5m -4 (14) (15)x -xy -12y x -6xy -16y (13)
八年级数学下----因式分解计算训练
一、提公因式法(1)8x -72 (2)a 2b -5ab (3)4m 3-6m 2
(4)a2b -5ab+9b (5)-a 2+ab-ac (6)-2x 3+4x2-2x
(7)8m 2n+2mn (8)a 2x 2y -axy 2 (9)3x 3-3x 2-9x
(10)-24x 2y -12xy 2+28y3 (11)2x 2-4x (12)-3ma 3+6ma2-12ma
(13)-2x 2-12xy 2+8xy3 (14)4a 2b 2-3ab 2+8ab 3c (15)-10x 3y 2z 3-35xy 3z 2+15x 2yz
(16)-4a 3b 3+6a2b -2ab (17)3ax 2-a 2x +ax (18)-15x 4y -20x 3y 3+5x 2y 3
(19) -x 2y +xy 2-xy (20)5(x -2) 2+a (2-x ) (11)-1x 2+2xy -xz 2
(22)7(2x -3y ) 2-14(2x -3y ) 3+21(2x -3y ) 5(23)1.21×13+1.21×9-12×1.21
(24)2.34×13.2+0.66×13.2 (25)2. 1⨯3. 14-4⨯3. 14+0. 7⨯3. 14 5
(26)9×10100-10101(27)4.3×201.2+7.5×201.2-1.8×201.2
(28)32004-32003; (29)(-2)101+(-2)100.
二.运用平方差公式因式分解
(1)x 2-y 2(2)-x 2+y2(3)64-a 2(4)4x 2-9y 2
42(5)36-25x (6) 16a -9b (7)9-0.01n 2(8)(x+p) 2-(x+q) 222
(9)4a 2-16 (10)a 5-a 3 (11)x 4-y 4 (12)12x 2-3y 2
2322-1+16x a b -4a b (16)(2x +y )-(x +2y )0. 49p -144(14) (15)(13)222
(17)32a 3-50ab 2(1) 4x 2-9y 2(2) 0. 81a 2-16b 2(20)7582-2582
44422(3) m 2-0. 012(22)-(b -c )+4a (23)1-16a b (24)1. 42⨯9-2. 32⨯36 9
(25)16(m-n) 2-9(m+n) 2(26)9x 2-(x-2y) 2(27)(3m +2n )2-(m -n )2
(28)4z 2-(x +y ) (29)4(x -y )2-25(x +y )2(30)(a +b +c )2-(a +b -c )2 2
三、运用完全平方公式-分解因式.
(1)a 2+8a +16;(2)(a +2b ) 2+6(a +2b ) +9;(3)x 2+2xy +2y 2
(4)x 2+6x +9;(5)4x 2-20x +25;(6)-4mn -4m 2-n 2
(7)a 2b 2-8abc +16c 2;(8)4a 2+2ab +b 2;(9)a 2x 2+16ax +64
(10)a 2b 2-2ab+1; (11) 9-12a+4a2; (12)x 2+
(13)(a+b)2+6(a+b)+9; (14)x 4y 4-8x 2y 2+16..
(16)a 2+10a+25 (17) m2-12mn+36n2(18)xy 3-2x 2y 2+x3y
(19)(x+2y)2-2(x+2y)+1 (15)(x+y)2-4(x+y-1)
四、十字相乘法分解因式专题练习(基础部分)
222(1)x +3x -4 (2)x -3x -4 (3)x +8x -20 121444x+. 39
(4)x 2-5x -24 (5)x 2+12x +27 (6)x 2-8x +12
(7)y 2-15y +36 (8)m 2+10m -24 (9)m 2+10m +24
(10)y 2+13y +36 (11)x 2+7xy -18y 2 (12)x 2-3xy -18y 2
22222-m -5m -4 (14) (15)x -xy -12y x -6xy -16y (13)