原式=2(√2+1)/(√2+1)(√2-1)+3-√18+2√2
=2(√2+1)/(2-1)+3-3√2+2√2
=2√2+2+3-√2
=√2+5
(√2-1)/2+√3(√3-√6)+√8
=(√2/2-1/2)+(√3×√3-√3×√(2×3)+√(2×2×2)
=(√2/2-1/2)+(√3×√3-√3×√2×√3)+√2×√2×√2
=√2/2-1/2+3-3√2+2√2
=5/2-√2/2
原式=2(√2+1)/(2-1)+3-3√2+2√2
=2√2+2+3-√2
=5+√2
5-根号2