1.4a^2-b^2+6a-3b2.a^2（b^2-c^2）-c^2（b-c）（a+b）3.20x^2-43xy+14y^24.5x^2+4xy-28y^25.20x^2-43xy+14y^26.3x^2+12x-57.x^2+4x-48.x^2-2xy-35y^29.2x^2-7x-1510.x^4+2x^2-311.(x+y)^2-3(x+y)+212.4x^2-12x+513.x^2+2-3x

1.4a^2-b^2+6a-3b2.a^2（b^2-c^2）-c^2（b-c）（a+b）3.20x^2-43xy+14y^24.5x^2+4xy-28y^25.20x^2-43xy+14y^26.3x^2+12x-57.x^2+4x-48.x^2-2xy-35y^29.2x^2-7x-1510.x^4+2x^2-311.(x+y)^2-3(x+y)+212.4x^2-12x+513.x^2+2-3x
1.4a^2-b^2+6a-3b
2.a^2（b^2-c^2）-c^2（b-c）（a+b）
3.20x^2-43xy+14y^2
4.5x^2+4xy-28y^2
5.20x^2-43xy+14y^2
6.3x^2+12x-5
7.x^2+4x-4
8.x^2-2xy-35y^2
9.2x^2-7x-15
10.x^4+2x^2-3
11.(x+y)^2-3(x+y)+2
12.4x^2-12x+5
13.x^2+2-3x

1.4a^2-b^2+6a-3b2.a^2（b^2-c^2）-c^2（b-c）（a+b）3.20x^2-43xy+14y^24.5x^2+4xy-28y^25.20x^2-43xy+14y^26.3x^2+12x-57.x^2+4x-48.x^2-2xy-35y^29.2x^2-7x-1510.x^4+2x^2-311.(x+y)^2-3(x+y)+212.4x^2-12x+513.x^2+2-3x
1.4a^2-b^2+6a-3b
=(2a+b)(2a-b)+3(2a-b)
=(2a-b)(2a+b+1)
2.a^2（b^2-c^2）-c^2（b-c）（a+b）
=a^2（b+c）(b-c)-c^2（b-c）（a+b）
=(b-c)[a^2(b+c)-c^2(a+b)]
3.20x^2-43xy+14y^2
=(8x-7y)(5x-2y))
4.5x^2+4xy-28y^2
=(5x+14y)(x-2y)
5.20x^2-43xy+14y^2
=(8x-7y)(5x-2y))
6.3x^2+12x-5
=3(x+2)^2-17
=3(x+2+√51/3)(x+2-√51/3)
7.x^2+4x-4
=(x+2)^2-8
=(x+2+2√2)(x+2-2√2)
8.x^2-2xy-35y^2
＝(x-y)^2-(6y)^2
=(x+5y)(x-7y)
9.2x^2-7x-15
=(x-5y)(2x+3y)
10.x^4+2x^2-3
=(x^2+3)(x^2-1)
=(x^2+3)(x-1)(x+1)
11.(x+y)^2-3(x+y)+2
=(x+y-1)(x+y-2)
12.4x^2-12x+5
=(2x-5)(2x-1)
13.x^2+2-3x
=(x-1)(x-2)

1.4a^2-b^2+6a-3b=(2a+b)(2a-b)+3(2a-b)=(2a-b)(2a+b+3)
2.a^2（b^2-c^2）-c^2（b-c）（a+b）=a^2(b+c)(b-c)-c^2(b-c)=(b-c)(a^2(b+c)-c^2)=.....
3.20x^2-43xy+14y^2=(4x-7y)(5x-2y)
4.5x^2+4xy-28y^2=(5x+14...

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1.4a^2-b^2+6a-3b=(2a+b)(2a-b)+3(2a-b)=(2a-b)(2a+b+3)
2.a^2（b^2-c^2）-c^2（b-c）（a+b）=a^2(b+c)(b-c)-c^2(b-c)=(b-c)(a^2(b+c)-c^2)=.....
3.20x^2-43xy+14y^2=(4x-7y)(5x-2y)
4.5x^2+4xy-28y^2=(5x+14y)(x-2y)
5.20x^2-43xy+14y^2=(4x-7y)(5x-2y)
6.3x^2+12x-5=3(x-x1)(x-x2) x1、x2是方程3x^2+12x-5=0的解
7.x^2+4x-4=（x+2+2根号2）（x+2-2根号2）
8.x^2-2xy-35y^2=（x=5y）(x-7y)
9.2x^2-7x-15=(2x+3)(x-5)
10.x^4+2x^2-3=(x^2-1)(x^2+3)=(x+1)(x-1)(x^2+3)
11.(x+y)^2-3(x+y)+2=(x+y-1)(x+y-2)
12.4x^2-12x+5=(2x-1)(2x-5)
13.x^2+2-3x=(x-1)(x-2)

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1.4a^2-b^2+6a-3b=(2a+b)(2a-b)+3(2a-b)=(2a-b)(2a+b+3)
2.a^2(b^2-c^2)-c^2(b-c)(a+b)=(b-c)(a^2b+a^2c-c^2a-c^2b)
3.20x^2-43xy+14y^2=(5x-2)(4x-7)
4.5x^2+4xy-28y^2=(5x+14)(x-2)
5.20x^2-43xy+...

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1.4a^2-b^2+6a-3b=(2a+b)(2a-b)+3(2a-b)=(2a-b)(2a+b+3)
2.a^2(b^2-c^2)-c^2(b-c)(a+b)=(b-c)(a^2b+a^2c-c^2a-c^2b)
3.20x^2-43xy+14y^2=(5x-2)(4x-7)
4.5x^2+4xy-28y^2=(5x+14)(x-2)
5.20x^2-43xy+14y^2=(5x-2)(4x-7)
6.3x^2+12x-5=(x+6-√51)(x-6+√51)/9
7.x^2+4x-4=(x+2+2√2)(x+2-2√2)
8.x^2-2xy-35y^2=(x+5y)(x-7y)
9.2x^2-7x-15=(2x+3)(x-5)
10.x^4+2x^2-3=(x^2+3)(x^2-1)=(x^2+3)(x+1)(x-1)
11.(x+y)^2-3(x+y)+2=(x+y-1)(x+y-2)
12.4x^2-12x+5=(2x-5)(2x-1)
13.x^2+2-3x=(x-1)(x-2)

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