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输入1: a=4, b=, c=-3, d=0.836227706/8; 输出结果1: x1=-0.8829475929, x2=0.0348994967, x3=0.8480480962 m=-2.8222685077 n=26.8520911750i
输入2: a=4, b=-3, c=, d=0.836227706/8; 输出结果2: x1=0.6960643684, x2=0.2225948447, x3=-0.1686592131 m=0.5527314923 n=3.3294313174i
输入3: a=4, b=3, c=, d=0.836227706/8; 输出结果3: x1=-0.7916928105, x2=0.0208464053+0.1804808182i, x3=0.0208464053-0.1804808182i m=-6.1972685077 n=5.1976448471
第三个方程才是根式解,根据第三个方程可以得到第一个方程的近似的根式解。
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