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解法一 

218×730+7820×73

=(218×10)×(730÷10)+ 7820×73

=2180×73+7820×73

=(2180+7820)×73

=10000×73

=730000

解法二 

218×730+7820×73

=218×730+(7820÷10)× (73×10)

=218×730+782×730

=(218+782)×730

=1000×730

=730000

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