If the underlying fund goes Down 5% on Day #1 then it must go UP 5.263% on Day #2 to "Recover 100%".
Therefore in the 3X Fund ... Day #1 it does Down 15% (-5% x 3) from 100% to 85% Day #2 it goes Up 15.789% (+5.263% x 3) from 85% to 98.42%
Not quite as bad as your math states. Yes there is a slow and constant loss in 2X & 3X funds due to the math. But it will be insignificant if you invest Long/Short correctly.
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