√18+√1╱2×√2+(√27-√48)÷3=3√2+1+(3√3-4√3)/3=3√2+1-√3/3写的清楚,看的明白,欢迎采纳!
√18+1+√3-4√3/33√2+1-√3/3
√18=3√2,√1/2×√2=1,√27=3√3,√48=4√3,3√2+1+(3√3-4√3)÷3=3√2+1-√3/3
(7√2-√3)/3