78*25+25*23-25巧算
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![78*25+25*23-25巧算](/uploads/image/z/608944-40-4.jpg?t=78%2A25%2B25%2A23-25%E5%B7%A7%E7%AE%97)
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78*25+25*23-25巧算
78*25+25*23-25巧算
78*25+25*23-25巧算
78*25+25*23-25
=78*25+25*23-25*1
=(78+23-1)x25
=100x25
=2500
78*25+25*23-25
=25*(78+23-1)
=25*100
=2500
78*25+25*23-25
=25*(78+23-1)
=25*100
=2500