已知一元三次方程:X^3-X^2+8X+12=0有两个相等的根,解这个方程.

问题描述:

已知一元三次方程:X^3-X^2+8X+12=0有两个相等的根,解这个方程.

-1/3*(197+12*354^(1/2))^(1/3)+23/3/(197+12*354^(1/2))^(1/3)+1/31/6*(197+12*354^(1/2))^(1/3)-23/6/(197+12*354^(1/2))^(1/3)+1/3+1/2*i*3^(1/2)*(-1/3*(197+12*354^(1/2))^(1/3)-23/3/(197+12*354^(1/2))^(1/3)...