①12.5-4.6-5.4
②2.5÷
③×48
④
×3.72+60%×1.28 3.14×(52-42) 13.09-(+3.09)
12×(+-) ×+÷3 ÷[(+)×]
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×