第9章 9.4

(1)

$256 \times 1024 \div 8192 = 2^8 \times 2^{10} \times 2^{-13} = 2^5 = 32$

(2)

$\sqrt{1024} \times \sqrt[4]{625} = \sqrt{2^{10}} \times \sqrt[4]{5^4} = 2^5 \times 5 = 160$