y-(x1平方)/(2p)=(x1/p)(x-x1),下一条把x1换成x2.x1x2=-p平方.解得y=-p/2,x=(x1+x2)/2.
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![y-(x1平方)/(2p)=(x1/p)(x-x1),下一条把x1换成x2.x1x2=-p平方.解得y=-p/2,x=(x1+x2)/2.](/uploads/image/z/14655673-1-3.jpg?t=y-%EF%BC%88x1%E5%B9%B3%E6%96%B9%EF%BC%89%EF%BC%8F%EF%BC%882p%EF%BC%89%3D%EF%BC%88x1%EF%BC%8Fp%EF%BC%89%EF%BC%88x-x1%EF%BC%89%2C%E4%B8%8B%E4%B8%80%E6%9D%A1%E6%8A%8Ax1%E6%8D%A2%E6%88%90x2.x1x2%3D-p%E5%B9%B3%E6%96%B9.%E8%A7%A3%E5%BE%97y%3D-p%EF%BC%8F2%2Cx%3D%EF%BC%88x1%2Bx2%EF%BC%89%EF%BC%8F2.)
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