78*25+25*23-25巧算

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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