0.25×28= 500×1%= 0.81× = 0.32-0.22=
8×4÷8×4= 1÷3× = 0.8÷0.01= 98÷22=
+80%× ÷× [×(4-)]÷
①
②
③0.79×99+0.79
④3.8×97+0.38×30
⑤
⑥(﹣)×9×12