<PRE><B>Question 640478</B>
 -(1/64)^-4/3
-----------
=  -(64)^4/3
=  -64*(64)^1/3
= -64*4
= -256
==============
or
 -(1/64)^-4/3
=  -(64)^4/3
-----------
=  -(4)^4
= -256</PRE>