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办公软件不同格式doc与docx、ppt与pptx、XLS和XLSX有什么区别
办公软件Microsoft Office 或 WPS Office都有两种保存格式，Word有doc与docx格式，PPT有ppt与pptx格式，Excel有XLS和XLSX格式，这里面有什么区别呢？为什么最后都多了个“x”呢？我们正常使用需要什么样的格式呢？
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