两道一元二次方程1.已知方程x^2+px+q=0的一个根与x^2+qx-p=0的一个根互为相反数,且p+q=0,求p-q的值2.已知关于x的方程x^2+mx-1=0和方程2x^2-(m-3)x-5=0有一个相同的根,求这个相同的根第一题我也是用的那
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![两道一元二次方程1.已知方程x^2+px+q=0的一个根与x^2+qx-p=0的一个根互为相反数,且p+q=0,求p-q的值2.已知关于x的方程x^2+mx-1=0和方程2x^2-(m-3)x-5=0有一个相同的根,求这个相同的根第一题我也是用的那](/uploads/image/z/3012517-37-7.jpg?t=%E4%B8%A4%E9%81%93%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B1.%E5%B7%B2%E7%9F%A5%E6%96%B9%E7%A8%8Bx%5E2%2Bpx%2Bq%3D0%E7%9A%84%E4%B8%80%E4%B8%AA%E6%A0%B9%E4%B8%8Ex%5E2%2Bqx-p%3D0%E7%9A%84%E4%B8%80%E4%B8%AA%E6%A0%B9%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E4%B8%94p%2Bq%3D0%2C%E6%B1%82p-q%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A5%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bx%5E2%2Bmx-1%3D0%E5%92%8C%E6%96%B9%E7%A8%8B2x%5E2-%28m-3%29x-5%3D0%E6%9C%89%E4%B8%80%E4%B8%AA%E7%9B%B8%E5%90%8C%E7%9A%84%E6%A0%B9%2C%E6%B1%82%E8%BF%99%E4%B8%AA%E7%9B%B8%E5%90%8C%E7%9A%84%E6%A0%B9%E7%AC%AC%E4%B8%80%E9%A2%98%E6%88%91%E4%B9%9F%E6%98%AF%E7%94%A8%E7%9A%84%E9%82%A3)
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