Question

Aratati ca : 2 la puterea -1 + 2 la puterea -2 =0,75 

Answer 1

$2^{-1} = \frac{1}{2} =0,5$
$2^{-2} = \frac{1}{4} =0,25$
$2^{-1} + 2^{-2} =0,5+0,25=0,75$

Answer 2

2 la puterea -1=1supra 2 2 la puterea -2 =1supra 4 1 la puterea 2 amplificam cu 2si primim 2supra 4 +1 supra 4 =3 supra 4