7.69*2.1+2.1*1.31+2.1怎样简便计算

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7.69*2.1+2.1*1.31+2.1怎样简便计算
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7.69*2.1+2.1*1.31+2.1怎样简便计算
7.69*2.1+2.1*1.31+2.1怎样简便计算

7.69*2.1+2.1*1.31+2.1怎样简便计算
7.69*2.1+2.1*1.31+2.1
=2.1*(7.69+1.31+1)
=21