问题 计算题
脱式计算。(能简算的要简算)         
(1)( 9.25+ 0.3×33-1.99)÷2.5 (2)(5.7×1.2+1.2×4.3)×2.5
(3)(2.87×9.4-9.4×1.87)×0.13(4)[2.9-1.8÷( 4.8-3.9)]×3
答案

  

(1)( 9.25+ 0.3×33-1.99)÷2.5 

         =(9.25+9.9-1.99)÷2.5
         =17.16÷2.5
         =6.864(2)(5.7×1.2+1.2×4.3)×2.5
         =(5.7+4.3)×1.2×2.5
         =10×1.2×2.5
         =30 
(3)(2.87×9.4-9.4×1.87)×0.13
         =(2.87-1.87)×9.4×0.13
         =1×9.4×0.13
         =1.222  (4)[2.9-1.8÷( 4.8-3.9)]×3

        =[2.9-1.8÷0.9]×3

        = ( 2.9-2)×3

        = 2.7

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