(√12+5√8)√3
=2√3×√3+5x2√2x√3
=6+10√6
(2√3+3√2)(2√3-3√2)
=﹙2√3﹚²-﹙3√2﹚²
=12-18
=-6
﹙5√3+2√5)²
=﹙5√3﹚²+2x5x√3x2√5+﹙2√5﹚²
=75+20√15+20
=95+20√15
(√48+1/4√6)÷√27
=(4√3+√6/24) ÷3√3
=4/3+√2/72
(√12+5√8)√3
=2√3×√3+5x2√2x√3
=6+10√6
(2√3+3√2)(2√3-3√2)
=﹙2√3﹚²-﹙3√2﹚²
=12-18
=-6
﹙5√3+2√5)²
=﹙5√3﹚²+2x5x√3x2√5+﹙2√5﹚²
=75+20√15+20
=95+20√15
(√48+1/4√6)÷√27
=(4√3+√6/24) ÷3√3
=4/3+√2/72