x²+2x-3 2x²-7x+6 3x²y²-10xy+7 -y²+20y-96 用配方法把上述因式分解
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![x²+2x-3 2x²-7x+6 3x²y²-10xy+7 -y²+20y-96 用配方法把上述因式分解](/uploads/image/z/11501842-58-2.jpg?t=x%26%23178%3B%2B2x-3+2x%26%23178%3B-7x%2B6+3x%26%23178%3By%26%23178%3B-10xy%2B7+-y%26%23178%3B%2B20y-96+%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E6%8A%8A%E4%B8%8A%E8%BF%B0%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3)
x²+2x-3 2x²-7x+6 3x²y²-10xy+7 -y²+20y-96 用配方法把上述因式分解
x²+2x-3 2x²-7x+6 3x²y²-10xy+7 -y²+20y-96 用配方法把上述因式分解
x²+2x-3 2x²-7x+6 3x²y²-10xy+7 -y²+20y-96 用配方法把上述因式分解
x²+2x-3 =x²+2x+1-4=(x+1)^2-4 =(x+1-2)(x+1+2)=(x-1)(x+3)
3x²y²-10xy+7 =(9x²y²-30xy+25-4)/3=[(3xy-5)^2-4]/3=1/3*(3xy-7)(3xy-3)
-y²+20y-96=-(y²-20y+100-4)=-[(y-10)^2-4]=-(y-8)(y+12)