(1+√3)(2-√3)
=2+2√3-√3-3
=√3-1
(√3-√2分之3)平方
=3-3√2+9/4
=21/4-3√2
√5分之(√20+√80)
=2+4
=6
(2√3-1)平方
=12-4√3+1
=13-4√3