Question

求速解一元三次方程45t的三次方减504t的平方加1200t减400等于零求解要快,有把握正确.快

Answer 1

x1=2/15*(2827+175*i*487^(1/2))^(1/3)+568/15/(2827+175*i*487^(1/2))^(1/3)+56/15

x2=-1/15*(2827+175*i*487^(1/2))^(1/3)-284/15/(2827+175*i*487^(1/2))^(1/3)+56/15+i*3^(1/2)*(1/15*(2827+175*i*487^(1/2))^(1/3)-284/15/(2827+175*i*487^(1/2))^(1/3))

x3=-1/15*(2827+175*i*487^(1/2))^(1/3)-284/15/(2827+175*i*487^(1/2))^(1/3)+56/15-i*3^(1/2)*(1/15*(2827+175*i*487^(1/2))^(1/3)-284/15/(2827+175*i*487^(1/2))^(1/3))