x三次方-2*x平方-16=0的解.就是x^3-2x^2-16=0的解_数学解答

x三次方-2*x平方-16=0的解.
就是x^3-2x^2-16=0的解

人气：162 ℃　时间：2020-05-11 02:58:26

解答

2/3*(28+3*87^(1/2))^(1/3)+2/3/(28+3*87^(1/2))^(1/3)+2/3
-1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3)+2/3+i*3^(1/2)*(1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3))
-1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3)+2/3-i*3^(1/2)*(1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3))