2.5×(1.9+1.9+1.9+1.9) 160×3.5×0.125
24×+72÷5+14×20% 18×4.3+36×2.05+×32
+×+ 7.5×+2.5÷
2.4×(1.01-0.88)÷0.52 1.2+〔(0.5-)×1.8〕
×= 1-= (7+)×8=
+= +6= 0.1+10%=
①(++)÷
②35.21×73-3521×0.29+352×5
125%×32×0.25 ×20-×5 ÷××17+×40% 18--
①156+28+72+44
②15.28﹣3.9﹣6.1
③12.5×8÷12.5×8
④÷[-(-)]