十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2
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![十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2](/uploads/image/z/2994754-58-4.jpg?t=%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E8%A7%A3%E9%A2%981%292x2%EF%BC%8D5x%EF%BC%8D12%EF%BC%9B+%282%293x2%EF%BC%8D5x%EF%BC%8D2%EF%BC%9B+%283%296x2%EF%BC%8D13x%2B5%EF%BC%9B+%284%297x2%EF%BC%8D19x%EF%BC%8D6%EF%BC%9B+%285%2912x2%EF%BC%8D13x%2B3%EF%BC%9B+%286%294x2%2B24x%2B27.%281%296x2%EF%BC%8D13xy%2B6y2%EF%BC%9B+%282%298x2y2%2B6xy%EF%BC%8D35%EF%BC%9B+%283%2918x2%EF%BC%8D21xy%2B5y2)
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