㏒₁/₇₅375√3 = -㏒₇₅375√3 =  - (㏒₇₅75*5*√3) = - (㏒₇₅75+ ㏒₇₅√75) =

= - (1+ 1/2) = -1,5

㏒₁/₈972√2 = - ( ㏒₁₈ 324*3*√2) =- ( ㏒₁₈ 324*3*√2) = - ( ㏒₁₈ 18²+㏒₁₈√18) =

= - ( 2+ 1/2) = -2,5