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Count the mathematical significance of each day according to the records of the quantity of rice in and out of the grain depot in the table below. One, two, three, four, five. Storage volume (ton)+12-7-8+10-6 (1) Monday is ______ (2) Tuesday is ______ (3) Wednesday is ______ (4) Thursday is ______ (5) Friday is ______. Count out the mathematical significance of recording each day according to the record of the quantity of rice in and out of the grain depot in the table below. One, two, three, four, five. Storage volume (ton)+12-7-8+10-6 (1) Monday is ______ (2) Tuesday is ______ (3) Wednesday is ______ (4) Thursday is ______ (5) Friday is ______.
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How to calculate the formula 1/2+1/6+1/12+1/20+...+1/90 easily?
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