2.简便计算.42*(3/14-1/21)
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2.简便计算.42*(3/14-1/21)
2.简便计算.42*(3/14-1/21)
2.简便计算.42*(3/14-1/21)
7
42*(3/14-1/21)
=42*3/14-42*1/21
=9-2
=7
=42×3/14-42×1/21
=9-2
=7
等于7哦
42X(9/42一2/42)=42x7/42=7
42*3/14-42*1/21=9-2=7