54-154+25 5×4+425 4米+5厘米9厘米
28+268×7 9×5-93×9+4 1时-20分钟40分钟
×9<80 43>7×
①×4.5+6.5×80%﹣0.8
②4×0.8×25%×12.5
③[﹣(﹣)]÷
④2022×