①810÷18+285
②8.5﹣1.89﹣0.11
③3÷-÷3
④3.05×40%×25
⑤48×(-)
⑥[÷(-)]×
①
②
③0.79×99+0.79
④3.8×97+0.38×30
⑤
⑥(﹣)×9×12
( )
1÷0.25= +1 = ×24= + =
400×0.02= 10÷ = 6 ×0= 3× ﹣ ×3=