a) $$ \frac{(2^4)^4 \cdot 2^{12}}{2^{23}} = \frac{2^{16} \cdot 2^{12}}{2^{23}} = \frac{2^{28}}{2^{23}} = 2^{28-23} = 2^5 = 32 $$
б) $$ 0,25^4 \cdot 4^8 = (\frac{1}{4})^4 \cdot 4^8 = \frac{1}{4^4} \cdot 4^8 = 4^{8-4} = 4^4 = 256 $$
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