二次函数y=ax2+bx+c的图像如下图所示.那么abc,b2-4ac,2a+b,a+b+c五个代数式中,值为正的 有( )个
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![二次函数y=ax2+bx+c的图像如下图所示.那么abc,b2-4ac,2a+b,a+b+c五个代数式中,值为正的 有( )个](/uploads/image/z/2499145-25-5.jpg?t=%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax2%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E5%83%8F%E5%A6%82%E4%B8%8B%E5%9B%BE%E6%89%80%E7%A4%BA.%E9%82%A3%E4%B9%88abc%2Cb2-4ac%2C2a%2Bb%2Ca%2Bb%2Bc%E4%BA%94%E4%B8%AA%E4%BB%A3%E6%95%B0%E5%BC%8F%E4%B8%AD%2C%E5%80%BC%E4%B8%BA%E6%AD%A3%E7%9A%84+%E6%9C%89%EF%BC%88+%EF%BC%89%E4%B8%AA)
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