16-6= 15-5= 15-10=13-10= 10+3= 10+10
(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]