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2023-10-12 17:12:41
(1/2+1/6+1/12+1/20+...+1/72) : X = 3/4
(1/1x2+1/2x3+1/3x4+1/4x5+...+1/7x8) : X = 3/4
(1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+...+1/7-1/8) : X = 3/4
(1/1-1/8) : X = 3/4
7/8 : X = 3/4
X = 7/8 : 3/4
X = 7/6