x=1.67165994274725/4^(1/3) 0.0664675322233947*4^(1/3); x = -((căn bậc hai(5)*căn bậc hai(797)+63)^(2/3)*(căn bậc hai(3)*i+1)+2^(4/3)*căn bậc hai(3)*i-2^(4/3))/(3*2^(5/3)*(căn bậc hai(5)*căn bậc hai(797)+63)^(1/3));x = ((căn bậc hai(5)*căn bậc hai(797)+63)^(2/3)*(căn bậc hai(3)*i-1)+2^(4/3)*căn bậc hai(3)*i+2^(4/3))/(3*2^(5/3)*(căn bậc hai(5)*căn bậc hai(797)+63)^(1/3));
x^2-7/6x+1/3=0
Bạn bấm máy tính sẽ ra được:
<=> (x-2/3)(x-1/2)=0
<=> x-2/3=0 hoặc x-1/2=0
TH1: x-2/3=0
<=> 2=2/3
TH2: x-1/2=0
<=> x=1/2