（3√2+1)(√18-1)-(2√2-1)²=(18-1)-(8-4√2+1)=17-9+4√2=8+4√2 (-1)^-1+(√3-2)^0+|√2-3|+√2-1+√8开3方=-1+√3-2+3-√2+√2-1+2=1+√3
