23*56-3.5*230+2300*0.79 求简便计算.要利用到小数乘法积的变化规律!

问题描述:

23*56-3.5*230+2300*0.79 求简便计算.要利用到小数乘法积的变化规律!

23X56-23X10X3.5+23X100X0.79=23X(56-35+79)=23X100

23*56-3.5*230+2300*0.79
=23x56-35x23+23x79
=23x(56-35+79)
=23x100
=2300
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