16.8*28能简算简算,要算式,

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16.8*28能简算简算,要算式,
16.8*28能简算简算,要算式,

16.8*28能简算简算,要算式,
16.8x28
=168X2.8
=(170-2)X(3-0.2)
=170x3-170x0.2-2X3+2x0.2
=510-34-6+0.4
=470.4

16.8*28
=(20-3.2)*28
=20*28-3.2*28
=560-32*28*0.1
=560-(30+2)*(30-2)*0.1
=560-(900-4)*0.1
=560-900*0.1+4*0.1
=560-90+0.4
=470.4

=(168*28)/10
=(98+70)(98-70)/10
=(98*98-70*70)/10
=4704/10=470.4
所有计算是简单的平方运算和减法运算,以及除10运算。