(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)急
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![(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)急](/uploads/image/z/2451442-58-2.jpg?t=%28-1%2A1%2F2%29%2B%28-1%2F2%2A1%2F3%29%2B%28-1%2F3%2A1%2F4%29%2B.%2B%28-1%2F2011%2A1%2F2012%29%E6%80%A5)
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(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)急
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)
急
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012)急