已知A(x1,2006),B(x2,2006)是二次函数y=ax²+bx+2005(a≠0)的图像上两点则当x=x1+x2时,二次函数的值是多少?由已知,x1、x2是方程ax²+bx+2005=2006的两个根∴x1+x2=-b/a,x1x2=-1/a∴f(x1+x2)=a(x1
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![已知A(x1,2006),B(x2,2006)是二次函数y=ax²+bx+2005(a≠0)的图像上两点则当x=x1+x2时,二次函数的值是多少?由已知,x1、x2是方程ax²+bx+2005=2006的两个根∴x1+x2=-b/a,x1x2=-1/a∴f(x1+x2)=a(x1](/uploads/image/z/12539844-36-4.jpg?t=%E5%B7%B2%E7%9F%A5A%28x1%2C2006%29%2CB%28x2%2C2006%29%E6%98%AF%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%26%23178%3B%2Bbx%2B2005%28a%E2%89%A00%29%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8A%E4%B8%A4%E7%82%B9%E5%88%99%E5%BD%93x%3Dx1%2Bx2%E6%97%B6%2C%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E7%94%B1%E5%B7%B2%E7%9F%A5%2Cx1%E3%80%81x2%E6%98%AF%E6%96%B9%E7%A8%8Bax%26%23178%3B%EF%BC%8Bbx%EF%BC%8B2005%EF%BC%9D2006%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%A0%B9%E2%88%B4x1%EF%BC%8Bx2%EF%BC%9D%EF%BC%8Db%2Fa%2Cx1x2%EF%BC%9D%EF%BC%8D1%2Fa%E2%88%B4f%28x1%EF%BC%8Bx2%29%EF%BC%9Da%28x1)
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