1. (2023五上·海口期末) 脱式计算。（能简便的应使用简便方法）

①31.5÷4.2﹣2.6×2.5

②3.52×8.6+8.6×0.48

③11+[（0.4+0.04）×0.5]

④0.59+2.94+1.41

⑤1.08÷（0.4+0.5）×0.6

⑥12.5×3.2×2.5