72×36×28的简便运算
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72X36X28
=(100-28)X36X28
=3600X28-36X28X28
=3600X28-36X(30-2)X28
=360X280-360X84+36X56
=360X(280-84)+36X(60-4)
=360X(200-4)+2160-144
=72000-1440+2160-144
=72000+2160-1584
=72000+2160-1600+16
=72000+576
=72576
=(100-28)X36X28
=3600X28-36X28X28
=3600X28-36X(30-2)X28
=360X280-360X84+36X56
=360X(280-84)+36X(60-4)
=360X(200-4)+2160-144
=72000-1440+2160-144
=72000+2160-1584
=72000+2160-1600+16
=72000+576
=72576
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