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根據韋達定理,x1+x2=-b/a,x1*x2=c/a 如果x1+x2>0,x1*x2>0,則兩根均為正 x1+x2>0,x1*x2
1.一元二次方程的定義一元二次方程有三個特點:(1)只含有一個未知數;(2)未知數的最高次數是2;(3)是整式方程.要判斷一個方程是否為一元二次方程,先看它是否為整式方程,若是,再對它進行整理.如果能整理為(a≠0)…
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