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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tomski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 coloring