1. (2019五上·江干期中) 递等式计算，能简便的简便计算.

①0.75×4×0.25×4

②15.58÷8.2-0.72

③8.84÷2.6+1.9

④4.16×25.7+41.6×7.43

⑤0.72÷0.9÷0.5

⑥0.8×1.2×12.5×5