①100﹣600÷25×4
②20﹣ ﹣
③13× +5×
④[ ﹣( + )]÷
①2.4÷×
②(+﹣)×36
③×99
④29.3﹣12.6﹣7.4
⑤5.9×8.5﹣49×0.85
⑥×[6÷(﹣)]
5÷0.02= 37.6-25.8= 234÷3= 45×7%=
2.4×2.5= ×5.6= ÷ = + =