1000-90-10-80-20-70-30-60-40-50-50
219+56+281+444
10000-3215-1785
62×(1450÷5)
①×4.5+6.5×80%﹣0.8
②4×0.8×25%×12.5
③[﹣(﹣)]÷
④2022×