3.25×6.8+67.5×0.68的简便计算解：根据提取公因式的简便方法，原式=3.25x6.8+6.75x6.8=（3.25+6.75）x6.8=10x6.8=68
3.25×6.8+67.5×0.68的简便计算=6.8x（3.25+6.75）=6.8x10=68
如图
