初三数学二次函数填空一道函数y1=x2+bx+c与y2=x的图像如图所示则正确的结论为 b2-4c>0 2.b+c+1=0 3 .3b+c+6=0 4.当1小于x小于3时y1小于y2
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![初三数学二次函数填空一道函数y1=x2+bx+c与y2=x的图像如图所示则正确的结论为 b2-4c>0 2.b+c+1=0 3 .3b+c+6=0 4.当1小于x小于3时y1小于y2](/uploads/image/z/8573163-51-3.jpg?t=%E5%88%9D%E4%B8%89%E6%95%B0%E5%AD%A6%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E5%A1%AB%E7%A9%BA%E4%B8%80%E9%81%93%E5%87%BD%E6%95%B0y1%3Dx2%2Bbx%2Bc%E4%B8%8Ey2%3Dx%E7%9A%84%E5%9B%BE%E5%83%8F%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E5%88%99%E6%AD%A3%E7%A1%AE%E7%9A%84%E7%BB%93%E8%AE%BA%E4%B8%BA+++b2-4c%EF%BC%9E0+++2.b%2Bc%2B1%3D0++++3+.3b%2Bc%2B6%3D0+++4.%E5%BD%931%E5%B0%8F%E4%BA%8Ex%E5%B0%8F%E4%BA%8E3%E6%97%B6y1%E5%B0%8F%E4%BA%8Ey2)
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