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我只說下高中階段需要掌握的解法,就是先猜出一個根m(通常為正負1,2,3這類小整數),然後利用因式分解將(x-m)作為一項,另外一項為(ax²;+bx+c)二者相乘,然後與原三次方程對應相等,解除abc,然後分解ax²;+bx+c=0,參照一元二次方程求出另外兩根. 高級解法見下連接.(高中不會用到)
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