12.09/2+1.91*0.5怎样简便计算

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12.09/2+1.91*0.5怎样简便计算12.09/2+1.91*0.5怎样简便计算12.09/2+1.91*0.5怎样简便计算原式=12.09/2+1.91/2=(12.09+1.91)/2=1

12.09/2+1.91*0.5怎样简便计算
12.09/2+1.91*0.5怎样简便计算

12.09/2+1.91*0.5怎样简便计算
原式=12.09/2+1.91/2
=(12.09+1.91)/2
=14/2
=7

原式可等于0.5*(12.09+1.91)=

0.5×(12.09+1.91)=7

原式=12.09*0.5+1.91*0.5
=(12.09+1.91)*0.5
=14*0.5
=0.7