如何累计计算多个时间段总时长
<p><span style="font-size: 16px;">在共计时长栏中输入公式「=TEXT(SUM(B2:B6),:mm:mm)」回车即可。</span><br></p><p><span style="font-size: 16px;"><br></span></p><p><span style="font-size: 16px;"><img src="https://res1.wpsacdm.cache.wpscdn.cn/images/ac84fa9acf395fbd95c75553e85c40d3.gif" title="录制_2021_03_23_17_12_55_537.gif" alt="录制_2021_03_23_17_12_55_537.gif" style="max-width: 800px"></span></p>
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