Question

$[(2x3x5)^{2} -2 ^{8} : 2^{6} ] : 4 - 2^{3} x 5 ^{2}$

Answer 1

$\displaystyle [(2 \cdot 3 \cdot 5)^2-2^8:2^6]:4-2^3 \cdot 5^2= \\ =(30^2-2^{8-6}):4-8 \cdot 25= \\ =(900-2^2):4-200= \\ =(900-4):4-200= \\ =896:4-200= \\ =224-200= \\ =24$