1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.+1/18x19+1/19x20计算方法与结果
<p>问题：1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.+1/18x19+1/19x20计算方法与结果<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">彭侃的回答：<div class="content-b">网友采纳 1/1x2=1-1/2 1/2x3=1/2-1/3 依此类推 原式=1-1/2+1/2-1/3+1/3-...+1/19-1/20 =1-1/20 =19/20
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