6x²-7x-5 5x²+6xy-8y²

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6x²-7x-55x²+6xy-8y²6x²-7x-55x²+6xy-8y²6x²-7x-55x²+6xy-8y

6x²-7x-5 5x²+6xy-8y²
6x²-7x-5 5x²+6xy-8y²

6x²-7x-5 5x²+6xy-8y²
十字相乘法
6x²-7x-5 =(2x+1)(3x-5)
5x²+6xy-8y²=(x+2y)(5x-4y)

5x²+6xy-8y²
=(x+2y)(5x-4y)
6x²-7x-5
=(2x+1)(3x-5)