perl -Mbignum -le 'print sqrt(33)'

##</code><code>##

5.74456264653802865985061146821892931822

##</code><code>##

perl -Mbignum -le 'print 2 ** 0.5'
returns:
1.41421356237309504880168872420969807857

##</code><code>##

perl -Mbignum -le 'print 10.01 ** -1'

##</code><code>##

0.0999000999000999000999000999000999000999