因式分解x^2-2xy-8y^2-x-14y-6解法一 用双十字相乘法分解 x^2-2xy-8y^2-x-14y-6 =(x^2-2xy-8y^2)-x-14y-6 =(x-4y)(x+2y)-x-14y-6 =(x-4y-3)(x+2y+2) 解法二 用待定系数法分解 x^2-2xy-8y^2-14y-6-x =(x+ay+b)(x+cy+d) =x^2+(a+c)xy+acy^2+(a
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![因式分解x^2-2xy-8y^2-x-14y-6解法一 用双十字相乘法分解 x^2-2xy-8y^2-x-14y-6 =(x^2-2xy-8y^2)-x-14y-6 =(x-4y)(x+2y)-x-14y-6 =(x-4y-3)(x+2y+2) 解法二 用待定系数法分解 x^2-2xy-8y^2-14y-6-x =(x+ay+b)(x+cy+d) =x^2+(a+c)xy+acy^2+(a](/uploads/image/z/1742381-53-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3x%5E2-2xy-8y%5E2-x-14y-6%E8%A7%A3%E6%B3%95%E4%B8%80+%E7%94%A8%E5%8F%8C%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E5%88%86%E8%A7%A3+x%5E2-2xy-8y%5E2-x-14y-6+%3D%28x%5E2-2xy-8y%5E2%29-x-14y-6+%3D%28x-4y%29%28x%2B2y%29-x-14y-6+%3D%28x-4y-3%29%28x%2B2y%2B2%29+%E8%A7%A3%E6%B3%95%E4%BA%8C+%E7%94%A8%E5%BE%85%E5%AE%9A%E7%B3%BB%E6%95%B0%E6%B3%95%E5%88%86%E8%A7%A3+x%5E2-2xy-8y%5E2-14y-6-x+%3D%28x%2Bay%2Bb%29%28x%2Bcy%2Bd%29+%3Dx%5E2%2B%28a%2Bc%29xy%2Bacy%5E2%2B%28a)
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