19-8√3=(4-√3)²,
所以=√(2+√3)/√6+√2,
又2(2+√3)=(√3+1)²,
?分母错了吧,应该是带括号的
所以=(√3+1)/√2*(√6+√2)=1/2
√[6-√(19-8√3)]/(√6+√2)
=√[6-√(4-√3)²]/(√6+√2)
=√[6-(4-√3)]/(√6+√2)
=√(2+√3)/(√6+√2)
=√(4+2√3)/(2√3+2)
=√(2+√3)²/(2√3+2)
=(2+√3)/(2√3+2)
=(2+√3)(2√3-2)/[(2√3+2)(2√3-2)]
=(2+2√3)/(12-4)
=(1+√3)/4
√(6-√(19-8√3)/√6+√2
= √(6-(4-√3)/√6+√2
=(2+√3)/√6+√2
=√6/3+√2/2+√2
=√6/3+3√2/2.