为什么二次方程当判别式 Δ＝0，要说「有两个相等的实数根」，而不说「有一个实数根」？ 知乎 Sketch Coloring Page

为什么二次方程当判别式 Δ＝0，要说「有两个相等的实数根」，而不说「有一个实数根」？ 知乎 Template

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