完整word版初二初三经典因式分解练习题62道答案.docx
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完整word版初二初三经典因式分解练习题62道答案.docx
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完整word版初二初三经典因式分解练习题62道答案
初二初三经典因式分解练习题62道及答案
1.3a³b²c-12a²b²c2+9ab²c³2.16x²-81
3.xy+6-2x-3y4.x²(x-y)+y²(y-x)
5.2x²-(a-2b)x-ab6.a4-9a²b²
7.x³+3x²-48.ab(x²-y²)+xy(a²-b²)
9.(x+y)(a-b-c)+(x-y)(b+c-a)10.a²-a-b²-b
11.(3a-b)²-4(3a-b)(a+3b)+4(a+3b)²12.(a+3)²-6(a+3)
13.(x+1)²(x+2)-(x+1)(x+2)²14.16x²-81
15.9x²-30x+2516.x²-7x-30
17.x(x+2)-x18.x²-4x-ax+4a
19.25x²-4920.36x²-60x+25
21.4x²+12x+922.x²-9x+18
23.2x²-5x-324.12x²-50x+8
25.3x²-6x26.49x²-25
27.6x²-13x+528.x²+2-3x
29.12x²-23x-2430.(x+6)(x-6)-(x-6)
31.3(x+2)(x-5)-(x+2)(x-3)32.9x²+42x+49
33.x4-2x³-35x34.3x6-3x²
35.x²-2536.x²-20x+100
37.x²+4x+338.4x²-12x+5
39.3ax²-6ax40.(x+2)(x-3)+(x+2)(x+4)
41.2ax²-3x+2ax-342.9x²-66x+121
43.8-2x²44.x²-x+14
45.9x²-30x+2546.-20x²+9x+20
47.12x²-29x+1548.36x²+39x+9
49.21x²-31x-2250.9x4-35x²-4
51.(2x+1)(x+1)+(2x+1)(x-3)52.2ax²-3x+2ax-3
53.x(y+2)-x-y-154.(x²-3x)+(x-3)²
55.9x²-66x+12156.8-2x²
57.x4-158.x²+4x-xy-2y+4
59.4x²-12x+560.21x²-31x-22
61.4x²+4xy+y²-4x-2y-362.9x5-35x3-4x
初二初三经典因式分解练习题62道答案
1.3a³b²c-12a²b²c2+9ab²c³2.16x²-81
=3ab2c(a2-4ac+3c2)=(4x)2-92
=3ab2c(a-3c)(a-c)=(4x+9)(4x-9)
3.xy+6-2x-3y4.x²(x-y)+y²(y-x)
=xy-(3x+3y)+6=x²(x-y)-y²(x-y)
=(x-3)(y-2)=(x²-y²)(x-y)
=(x-y)2(x-y)
5.2x²-(a-2b)x-ab6.a4-9a²b²
=2x²+(2b-a)x-ab=a2(a2-9b2)
=(2x-a)(x+b)=a2(a+3b)(a-3b)
7.x³+3x²-48.ab(x²-y²)+xy(a²-b²)
=X3-1+3x2-3=abx²-aby²+xya²-xyb²
=(x-1)(x2+x+1)+3(x2-1)=abx²+xya²-(aby²+xyb²)
=(x-1)(x2+x+1)+3(x+1)(x-1)=ax(bx+ay)-by(ay+xb)
=(x-1)[(x2+x+1)+3(x+1)]=(ax-by)(bx+ay)
=(x-1)(x2+4x+4)
=(x-1)(x+2)2
9.(x+y)(a-b-c)+(x-y)(b+c-a)10.a²-a-b²-b
11.(3a-b)²-4(3a-b)(a+3b)+4(a+3b)²12.(a+3)²-6(a+3)
13.(x+1)²(x+2)-(x+1)(x+2)²14.16x²-81
15.9x²-30x+2516.x²-7x-30
17.x(x+2)-x18.x²-4x-ax+4a
19.25x²-4920.36x²-60x+25
21.4x²+12x+922.x²-9x+18
23.2x²-5x-324.12x²-50x+8
25.3x²-6x26.49x²-25
27.6x²-13x+528.x²+2-3x
29.12x²-23x-2430.(x+6)(x-6)-(x-6)
31.3(x+2)(x-5)-(x+2)(x-3)32.9x²+42x+49
33.x4-2x³-35x34.3x6-3x²
35.x²-2536.x²-20x+100
37.x²+4x+338.4x²-12x+5
39.3ax²-6ax40.(x+2)(x-3)+(x+2)(x+4)
41.2ax²-3x+2ax-342.9x²-66x+121
43.8-2x²44.x²-x+14
45.9x²-30x+2546.-20x²+9x+20
47.12x²-29x+1548.36x²+39x+9
49.21x²-31x-2250.9x4-35x²-4
51.(2x+1)(x+1)+(2x+1)(x-3)52.2ax²-3x+2ax-3
53.x(y+2)-x-y-154.(x²-3x)+(x-3)²
55.9x²-66x+12156.8-2x²
57.x4-158.x²+4x-xy-2y+4
59.4x²-12x+560.21x²-31x-22
61.4x²+4xy+y²-4x-2y-362.9x5-35x3-4x
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