[中學] 一元二次方程式的根
假設下列的一元二次方程式有兩根 x_1 and x_2
x^2+k_1\,x+k_2=0,
where k_1 and k_2 are real numbers.
Re (x_1)>0 or Re (x_2)>0 的充分必要條件是？
Re=Real part
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