1. (2023六下·武侯期末)  用递等式计算，能简算的要简算

①4.12+ 1.37+ 0.88 + 3.63

②3.12÷2.5÷0.4

③48×()

④802-11×36

⑤0.56÷ (0.71+ 2.09)

⑥

⑦(0.84÷0.4+ 2.9)×0.4

⑧