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十字相乘:
(1)6x²-13x+6=(2x-3)(3x-2)
2 -3
3 -2
(2)x²-2x-35y²=(x+5y)(x-7y)
1 5
1 -7
(3)a²-5ab-24b²=(a+3b)(a-8b)
1 3
1 -8
(4)5x²-4x-28y²=(x+2y)(x-14y)
1 2
5 -14
分组分解:
x²-y²-2x+1=(x²-2x+1)-y²=(x-1)²-y²=(x-1+y)(x-1-y)=(x+y-1)(x-y-1)
(1)6x²-13x+6=(2x-3)(3x-2)
2 -3
3 -2
(2)x²-2x-35y²=(x+5y)(x-7y)
1 5
1 -7
(3)a²-5ab-24b²=(a+3b)(a-8b)
1 3
1 -8
(4)5x²-4x-28y²=(x+2y)(x-14y)
1 2
5 -14
分组分解:
x²-y²-2x+1=(x²-2x+1)-y²=(x-1)²-y²=(x-1+y)(x-1-y)=(x+y-1)(x-y-1)
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