用简便方法计算:2.47-1.67+3.53
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用简便方法计算:2.47-1.67+3.53用简便方法计算:2.47-1.67+3.53用简便方法计算:2.47-1.67+3.53(2-1.67)+(0.47+3.53)=0.33+4
用简便方法计算:2.47-1.67+3.53
用简便方法计算:2.47-1.67+3.53
用简便方法计算:2.47-1.67+3.53
(2-1.67)+(0.47+3.53)=0.33+4