- а) $$172_8$$:
$$
172_8 = 1 \cdot 8^2 + 7 \cdot 8^1 + 2 \cdot 8^0 = 1 \cdot 64 + 7 \cdot 8 + 2 \cdot 1 = 64 + 56 + 2 = 122_{10}
$$
Ответ: $$172_8 = 122_{10}$$
- б) $$2EA_{16}$$:
$$
2EA_{16} = 2 \cdot 16^2 + 14 \cdot 16^1 + 10 \cdot 16^0 = 2 \cdot 256 + 14 \cdot 16 + 10 \cdot 1 = 512 + 224 + 10 = 746_{10}
$$
Ответ: $$2EA_{16} = 746_{10}$$
- в) $$101010_2$$:
$$
101010_2 = 1 \cdot 2^5 + 0 \cdot 2^4 + 1 \cdot 2^3 + 0 \cdot 2^2 + 1 \cdot 2^1 + 0 \cdot 2^0 = 1 \cdot 32 + 0 \cdot 16 + 1 \cdot 8 + 0 \cdot 4 + 1 \cdot 2 + 0 \cdot 1 = 32 + 0 + 8 + 0 + 2 + 0 = 42_{10}
$$
Ответ: $$101010_2 = 42_{10}$$
- г) $$10,1_2$$:
$$
10,1_2 = 1 \cdot 2^1 + 0 \cdot 2^0 + 1 \cdot 2^{-1} = 1 \cdot 2 + 0 \cdot 1 + 1 \cdot \frac{1}{2} = 2 + 0 + 0,5 = 2,5_{10}
$$
Ответ: $$10,1_2 = 2,5_{10}$$
- д) $$243_6$$:
$$
243_6 = 2 \cdot 6^2 + 4 \cdot 6^1 + 3 \cdot 6^0 = 2 \cdot 36 + 4 \cdot 6 + 3 \cdot 1 = 72 + 24 + 3 = 99_{10}
$$
Ответ: $$243_6 = 99_{10}$$