2x²-5X-12
问题描述：
2x²-5X-12
7X²-19X-6
X²Y²+2XY-8
X²+2XY-8Y²
答
2x²-5X-12
=(2x+3)(x-4)
7X²-19X-6
=(7x+2)(x-3)
X²Y²+2XY-8
=(xy+4)(xy-2)
X²+2XY-8Y²
=(x+4y)(x-2y)