6x²-7x-5 5x²+6xy-8y²
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![6x²-7x-5 5x²+6xy-8y²](/uploads/image/z/2545708-4-8.jpg?t=6x%26%23178%3B-7x-5+5x%26%23178%3B%2B6xy-8y%26%23178%3B)
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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)