x三次方-2*x平方-16=0的解.
问题描述:
x三次方-2*x平方-16=0的解.
就是x^3-2x^2-16=0的解
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))