a)
$5^{\large 3}\times 5^{\large 4} = 5^{\large 7}$
b)
$2^{\large 5} \div 2^{\large 3} = 2^{\large 2}$
c)
$(0,5)^{\large 2} \times (0,2)^{\large 2} = (0,1)^{\large 2} = 0,01$
d)
$(0,4)^{\large -2} \times (-5)^{\large -2} = 0,25$
e)
$\dfrac{(0,05)^{\large 3}}{5^{\large 3}}\,=\,10^{\large -3}$
