提问:1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7 用简便方法
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![提问:1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7 用简便方法](/uploads/image/z/2704246-70-6.jpg?t=%E6%8F%90%E9%97%AE%3A1x1%2F2%2B1%2F2x1%2F3%2B1%2F3x1%2F4%2B1%2F4x1%2F5%2B1%2F5x1%2F6%2B1%2F6x1%2F7+%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
提问:1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7 用简便方法
提问:1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7 用简便方法
提问:1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7 用简便方法
1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/9-1/7
=1-1/7
=6/7