Tính nhanh: (-4).(+125).(...

- Hướng dẫn giải

(–4) . (+125) . (–25) . (–6) . (–8)

= [(–4) . (–25)] . [(+125) . (–8)] . (–6)

= (4 . 25) . [–(125 . 8)] . (–6)

= 100 . (–1000) . (–6)

= 100 . 1000 . 6 = 600 000