Question

ajutati-ma, va rog !

Answer 1

$\frac{2}{5} ^{1+2+3+4} : \frac{2}{5} ^{20} = \frac{2}{5} ^{10} : \frac{2}{5} ^{20} = \frac{2}{5} ^{10-20} = \frac{2}{5} ^{-10} = \frac{1}{ \frac{2}{5} ^{10} } = \frac{5 ^{10} }{2 ^{10} }$