1) 0,09^3/2=(√0,09)³=0,3³=0,027
2) (5 1/16)^3/4 =(⁴√81/16)³= (⁴√3⁴/ 2⁴)³=(3/2)³= 27/8=3 3/8
3) 36*6^(-5)=6²/ 6⁵ =1/6³
4) ( (3 6/7)^(1/2) - (1 5/7)^(1/2)):(3/28)^(1/2) =
= ( (27 /7)^(1/2) - (12/7)^(1/2)) * (28/3)^(1/2) =
= (27 /7)^(1/2) * (28/3)^(1/2) - (12/7)^(1/2)) * (28/3)^(1/2) =
=(9*4)^(1/2) - (4*4)^(1/2) =√36- √16=6-4=2