证明:x= 1 / (√3+√2)=√3-√21/x=√3+√2所以:x+1/x=2√3两边平方:x^2+1/x^2+2=12所以:x^2+1/x^2=10所以:x^5+x^4-10x^3-10x^2+x+1=(x+1)x^4-10(x+1)x^2+(x+1)=(x+1)(x^4-10x^2+1)=(x+1)(x^2-10+1/x^2)*(x^2)=(x+1)*(10-10)*(x^2)=0命题得证