`5^1∕4 xx (125)^0.25` `= 5^0.25 xx (5^3)^0.25` `= 5^0.25 xx 5^(3 xx 0.25)` `= 5^0.25 xx 5^0.75` `= 5^(0.25 + 0.75)` `= 5^1` `= 5`.