78*25+25*23-25巧算
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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=
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