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[NOIP2001]一元三次方程求解
Grade | 0 | Open Time | Tuesday, 15 January 2013, 4:15 pm |
Discount | 0.8 | Time Discount | Tuesday, 15 January 2013, 4:15 pm |
Allow late | Yes | Close Time | Tuesday, 15 January 2013, 4:15 pm |
Input file | 3cfc.in | Output file | 3cfc.out |
问题描述
有形如:ax3+bx2+cx+d=0 这样的一个一元三次方程。给出该方程中各项的系数(a,b,c,d 均为实数),并约定该方程存在三个不同实根(根的范围在-100至100之间),且根与根之差的绝对值>=1。要求由小到大依次在同一行输出这三个实根(根与根之间留有空格),并精确到小数点后2位。
提示:记方程f(x)=0,若存在2个数x1和x2,且x1
样例
输入:1 -5 -4 20
输出:-2.00 2.00 5.00