√32=√4²×2=4√2
√1/3=√(3/3²)=(√3)/3
√48=√(4²×3)=4√3
√1/8=√(2/4²)=(√2)/4
所以原式=(4-1/4)√2+(4-2/3)√3
=(15/4)√2+(10/3)√3