1.
2 5
4 -7
8x²+6x-35=(2x+5)(4x-7)
2.
3 -1
6 -5
18x²-21x+5=(3x-1)(6x-5)
3.
4 5
5 -4
20-9y-20y²
=-(20y²+9y-20)
=-(4y+5)(5y-4)
4.
有错误,估计是2x²+3x-5
1 -1
2 5
2x²+3x-5=(x-1)(2x+5)
5.
1 2
2 -3
2y²+y-6=(y+2)(2y-3)
6.
2 -3
3 -2
6x²-13x+6=(2x-3)(3x-2)
7.
1 -3
3 2
3a²-7a-6=(a-3)(3a+2)
8.
2 -3
3 -1
6x²-11x+3=(2x-3)(3x-1)
9.
2 1
2 3
4m²+8m+3=(2m+1)(2m+3)
10.
1 -2
10 -1
10x²-21x+2=(x-2)(10x-1)
11.
2 -3
4 -5
8m²-22m+15=(2m-3)(4m-5)
12.
2 -3
2 5
4n²+4n-15=(2n-3)(2n+5)
13.
2 5
3 -7
6a²+a-35=(2a+5)(3a-7)
14.
1 1
5 -13
5x²-8x-13=(x+1)(5x-13)
15.
1 3
4 3
4x²+15x+9=(x+3)(4x+3)
16.
3 -1
5 2
15x²+x-2=(3x-1)(5x+2)
17.
2 5
3 2
6y²+19y+10=(2y+5)(3y+2)