﹙√18﹚﹣﹙1／2﹚÷2﹣¹ +[1／﹙√2+1﹚] - [﹙√3﹚-1]º
=3√2-1/2÷1/2+√2-1-1
=4√2-3[1／﹙√2+1﹚]这里怎么处理1/(√2+1)=(√2-1)/(√2+1)(√2-1)=(√2-1)/(2-1)=√2-1