a)
\(\eqalign{& \sqrt {{0,16 \times 0,64 \times 64,225} } \cr & = \sqrt {0,16} \times \sqrt {0,64} \times \sqrt {225} \cr & = 0,4 \times 0,8 \times 15 = 4,8 \cr} \)
b)
\(\eqalign{& \sqrt { {250 \times 360} } \cr & = \sqrt {25 \times 36 \times 100} \cr & = \sqrt {25} \times \sqrt {36} \times \sqrt {100} \cr & = 5 \times 6 \times 10 = 300 \cr} \)
