1/(√2-1)+√3(√3-√6)+√8=(√2+1)/(√2+1)(√2-1)+3-3√2+√(2^2 *2)
=√2+1+3-3√2+2√2
=4
原式=
=根号2-1+3-3根号2+2根号2
=根号2+2根号2-3根号2-1+3
=2
绝对正确
问清楚点