①×4.5+6.5×80%﹣0.8
②4×0.8×25%×12.5
③[﹣(﹣)]÷
④2022×
①6.4×2.5×1.25
②8.5×98%
③÷4+×
④×
2﹣30%= +25%= 4.23﹣23%= ×=
3+= 4×15%= = +50%=