问题 计算题
判断正误,并把不对的改正过来。

(1)3.5×0.7-0.7
         =3.5×0        改正:
         =0
   

(2)13.4-0.4×3
       =13×3         改正
       =39
  
(3)1.25+0.7×0.8
       =1.25×0.8+0.7   改正
       =1+0.7
       =1.7
答案

(1)错误;改正:3.5×0.7-0.7

                            =2.45-0.7        

                            =1.75 

(2)错误;改正:13.4-0.4×3

                            =13.4-1.2         

                            =12.2  (3)错误;改正:1.25+0.7×0.8

                            =1.25+0.56  

                            =1.81

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