问题 计算题
脱式计算。(能简算的要简算)                           
(1)(30-19.8) ×0.6+31.2(2)[10-(6+3.03)] ×1.01
(3)73.6 ×27+73.6 ×73(4)49.2-0.5 ×0.5-8.75
(5)(291-38 ×3.5-35.5) ÷3.5(6)12.5 ×0.56 ×0.4 ×0.8 ×250
答案

            

(1)(30-19.8) ×0.6+31.2
  =10.2×0.6+31.2
  =6.12+31.2
  =37.32 (2)[10-(6+3.03)] ×1.01
  =[10-9.03]×1.01
  =0.97×1.01
  =0.9797
(3)73.6 ×27+73.6 ×73
  =73.6×(27+73)
  =73.6×100
  =7360 

(4)49.2-0.5 ×0.5-8.75

 =49.2-0.25-8.75

 =49.2-(0.25+8.75)

 =49.2-9

 =40.2

(5)(291-38 ×3.5-35.5) ÷3.5

 =(291-133-35.5)÷3.5

 =122.5÷3.5

 =35 (6)12.5 ×0.56 ×0.4 ×0.8 ×250

 =(12.5×0.8)×(0.4×250)×0.56

 =10×100×0.56

 =560

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