72乘0.03加0.3乘2.8简便算法怎样算?

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72乘0.03加0.3乘2.8简便算法怎样算?72乘0.03加0.3乘2.8简便算法怎样算?72乘0.03加0.3乘2.8简便算法怎样算?72x0.03+0.3x2.8=0.3x7.2+0.3x2.8

72乘0.03加0.3乘2.8简便算法怎样算?
72乘0.03加0.3乘2.8简便算法怎样算?

72乘0.03加0.3乘2.8简便算法怎样算?
72x0.03+0.3x2.8
=0.3x7.2+0.3x2.8
=0.3x(7.2+2.8)
=0.3x10
=3

72x0.03+0.3x2.8
=0.03*72+0.03*28
=0.03*(72+28)
=0.03*100
=3
选我吧!

72*0.03+0.3*2.8=7.2*0.3+0.3*2.8=0.3*(7.2+2.8)=3