Question

Arîătați că

$2^{-1} + 2^{-2} = 0,75$

Answer 1

2^-1 + 2^-2 =
= 1/2 + 1/2^2 =
= 1/2 + 1/4 =
= 0,5 + 0,25 =
= 0,75

Answer 2

$2^{-1}+2^{-2} =\dfrac{1}{2^1}+\dfrac{1}{2^2} =\dfrac{1}{2}+\dfrac{1}{4} = 0,50+0,25 = 0,75$