x﹣60%x=36
0.5x﹣2.5=2.5
2.3+5.7=
12.2﹣0.5=
140×0.3=
401﹣198=
3600÷12=
+ =
﹣ =
×240=
÷ =
25%×5.6÷ =
20﹣12÷