x=√2+11/x=1/(√2+1)=√2-1x²-1/x²+x÷{x-【2x-1/x】}=x²-1/x²+x÷(x²-2x+1)/x=x²-1/x²+x²/(x-1)²=(x+1/x)(x-1/x)+[x/(x-1)]²=2√2*2+(√2+1)²/2=4√2+3/2...