12.09/2+1.91*0.5怎样简便计算
问题描述：
12.09/2+1.91*0.5怎样简便计算
答
原式=12.09*0.5+1.91*0.5
=（12.09+1.91）*0.5
=14*0.5
=0.7
答
0.5×(12.09+1.91)=7
答
原式=12.09/2+1.91/2
=（12.09+1.91)/2
=14/2
=7
答
原式可等于0.5*(12.09+1.91)＝