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780×78+280×72简便方法

780×78+280×72简便方法

2025-04-06 21:56:39

推荐回答（1个）

回答1：

解: 780×78+280×72
=780×72+780x6+220×72+60x72
=72x(780+220)+78x60+60x72
=72x1000+60x(78+72)
=72000+60x150
=72000+9000
=81000

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