A.
4√3 + √3 = 5√3
B
5√8 - √ 2 = 5*2√2-√2=10√2-√2=9√2
√8 = 2√2
C
2√3*√3 = 2*3=6
D
2√8 : 2√2 + 3 = 2*2√2 : 2√2 +3 = 4√2 : 2√2 + 3= 2+3=5
E
(√2)2 = √2*√2= 2