`(32/243)^(-4∕5)` `= (243/32)^(4∕5)` `= (3^5/2^5)^(4∕5)` `= [(3/2)^5]^(4∕5)` `= (3/2)^(5 xx (4/5)` `= (3/2)^4` `= (3^5/2^5)^(4∕5)` `= [(3/2)^5]^(4∕5)` `= (3/2)^4` `= 3^4/2^4` `= 81/16`