12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?

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12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?12.3

12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?
12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?

12.3乘9.5+12.3乘2.5减12.3乘2这道题怎样简算?
12.3*(9.5+2.5-2)=123