问题 计算题
脱式计算。(能简算的要简算)      
(1)0.36+0.545+0.45    (2)8.3-0.46-1.237  
(3)23.4-5.85-4.15    (4)39.7+ 20.43+ 0.3+ 9.57  
(5)14.52-(4.52+7.88)(6)15.28 +28.99+ 20.72
答案

   

(1)0.36+0.545+0.45    
       =0.905+0.45
       =1.355    (2)8.3-0.46-1.237  
        =7.84-1.237
        =6.603  
(3)23.4-5.85-4.15    
       =23.4-(5.85+4.15)
       =23.4-10
       =13.4(4)39.7+ 20.43+ 0.3+ 9.57  
        =(39.7+0.3)+(20.43+9.57)
        =40+30

        =70  

(5)14.52-(4.52+7.88)

        =14.52-12.4

        =2.12  

(6)15.28 +28.99+ 20.72

        =(15.28+20.72)+28.99

        =36+28.99

        =64.99

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