36-1920 43+3355 58-2226
72-1638 69+1672 85-2542
70+24=
81-5=
9+36=
55-15=
22-6=
49+6=
45+54=
7+63=
①×4.5+6.5×80%﹣0.8
②4×0.8×25%×12.5
③[﹣(﹣)]÷
④2022×