x-3）（x+3)（x^4+9x²+81）=(x^2-9)(x^4+9x²+81)=(x²-9)(x²-9)²=(x²-9)^3=x^6-729-2*根号2-1=1-2√2+(√2)²-(√2)²-1-1=(√2-1)²-3=(√2-1+√3)(√2-1-√3)...