第一题:2008又1/2007×2007/2008=?第二题:已知1/6=1/2-1/3,1/12=1/3-1/4,1/20=1/4-1/5,那么1/6+1/12+1/20+1/30+1/42+1/56=?
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![第一题:2008又1/2007×2007/2008=?第二题:已知1/6=1/2-1/3,1/12=1/3-1/4,1/20=1/4-1/5,那么1/6+1/12+1/20+1/30+1/42+1/56=?](/uploads/image/z/10442452-4-2.jpg?t=%E7%AC%AC%E4%B8%80%E9%A2%98%EF%BC%9A2008%E5%8F%881%2F2007%C3%972007%2F2008%3D%3F%E7%AC%AC%E4%BA%8C%E9%A2%98%EF%BC%9A%E5%B7%B2%E7%9F%A51%2F6%3D1%2F2-1%2F3%2C1%2F12%3D1%2F3-1%2F4%2C1%2F20%3D1%2F4-1%2F5%2C%E9%82%A3%E4%B9%881%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%3D%3F)
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