12+4= 12+7= 11+4=12+3= 16+2= 11+6=
(2.4×1.5-1.5)÷0.7
(3.2+3.2+3.2+3.2) ×2.5
+-
3600÷45×90
93.6÷[(54.8+45.2)×0.06]