Thực hiện phép tính: a) (–2). (–2). (–2); b) (–0,5)

a) (–2). (–2). (–2) = 4.(–2) = –8.

b) (–0,5).(–0,5) = $\frac{-1}{2}.\frac{-1}{2}=\frac{\left(-1\right).\left(-1\right)}{2.2}=\frac{1}{4}.$

c) $\frac{1}{2}.\frac{1}{2}.\frac{1}{2}.\frac{1}{2}=\frac{\mathrm{1.1.1.1}}{\mathrm{2.2.2.2}}=\frac{1}{16}.$