Question 1045924
it's not quite clear do you have  {{{(3sqrt(64)*9^3)^-1 }}} or   {{{(3sqrt(649^3))^-1 }}}

in case you have {{{(3sqrt(64)*9^3)^-1 }}}:

{{{(3sqrt(64)*9^3)^-1 = (3*8*729)^-1 = (17496)^-1 =1/17496=0.000057155921}}} or » {{{0.00006}}}


in case you have {{{(3sqrt(649^3))^-1 }}}:

{{{(3sqrt(649^3))^-1=(3sqrt(649^2*649))^-1 =(3*649sqrt(649))^-1=(1947sqrt(649))^-1=1/(1947sqrt(649))=1/(1947(25.4754784))=1/49600.7564559251=0.00002016}}}