12×25+75×24巧算,
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12×25+75×24巧算,
12×25+75×24巧算,
12×25+75×24巧算,
12×25+75×24
=3x4x25+3x25x4x6
=3x100+18x100
=2100
12×25+75×24巧算,
12×25+75×24巧算,
12×25+75×24巧算,
12×25+75×24
=3x4x25+3x25x4x6
=3x100+18x100
=2100