43*24+57*43+81*57用简便方法,

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43*24+57*43+81*57用简便方法,43*24+57*43+81*57用简便方法,43*24+57*43+81*57用简便方法,43*24+57*(24+19)+81*57=43*24+57

43*24+57*43+81*57用简便方法,
43*24+57*43+81*57用简便方法,

43*24+57*43+81*57用简便方法,
43*24+57*(24+19)+81*57
=43*24+57*24+57*19+81*57
=24*(43+57)+57*(19+81)
=24*100+57*100
=(24+57)*100
=81*100
=8100