(9/√2-√98/3)×2√2
=9/√2×2√2-7√2/3×2√2
=9×2-14×2/3
=18-28/3
=8又2/3
根号二分之九,二分之九在根号里面还是外面里面（√﹙9/2﹚-√98/3)×2√2=3/√2×2√2-7√2/3×2√2=3×2-14×2/3=6-28/3=18/3-28/3=-10/3