a)
1111₍₂₎ =
= (1·2⁰+1·2¹+1·2²+1·2³)₍₁₀₎
= (1+2+4+8)₍₁₀₎
= 15₍₁₀₎
b)
10001₍₂₎ =
= (1·2⁰+0·2¹+0·2²+0·2³+1·2⁴)₍₁₀₎
= (1+0+0+0+16)₍₁₀₎
= 17₍₁₀₎
c)
101011₍₂₎
= (1·2⁰+1·2¹+0·2²+1·2³+0·2⁴+1·2⁵)₍₁₀₎
= (1+2+0+8+0+32)₍₁₀₎
= 43₍₁₀₎
d)
11111101₍₂₎ =
= (1·2⁰+0·2¹+1·2²+1·2³+1·2⁴+1·2⁵+1·2⁶+1·2⁷)₍₁₀₎
= (1+0+4+8+16+32+64+128)₍₁₀₎
= 253₍₁₀₎
