①4362+48+138+152
②482-68+118-132
③49000÷8÷125
④57×128-57×27-57
①﹣(+)
②8.89﹣1.84﹣3.16
③÷9+×
④12.5×0.32×2.5
①
②6.875﹣
③372÷25÷0.4
④77×