14+73= 92﹣34= 14×2= 35﹣23= 180+320=
400×3= 38+47= 43×2= 54+28= 270+300=
12×3= 60﹣13= 465×0= 48+8= 2600﹣600=
21﹣12= + = ﹣ = + = 1﹣ =