把3.99×0.5的积精确到百分位是2.00.
①418.63×0.87≈
②206.54×3.6≈
③28.45×105.27≈
④317.49×83.87≈
⑤623.43×20.5≈
⑥127.75×34.5≈
⑦723.65×12.36≈
⑧512.78×86.05≈