1.
√8 -(√48)/8 -[(2/3)*√(9/2) -2√(3/4)
=2√2- 4√3 /8 -[(2/3)*3/2*√2 -√3]
=2√2 -√3 /2 -√2 +√3
=√2 +√3 /2
2.
√18 -2√(1/2) -3√(1/3) -[√(1/8) -√12]
=3√2 -√2 -√3 -(√2)/4+2√3
=2√2+√3-(√2)/4
=(7√2)/4 +√3
3.
(1+√3)(√3 -1) (平方差公式)
=(√3)² -1
=3-1
=2
4.
(-5)²+√4*√(1/2)+|√2-2|-(立方根9)³
=25+2*(√2)/2 +2-√2-9
=18