The calculation method of adding fractions with the same denominator can be written as (A / C) + (B / C) + (a + B / C) (C is not equal to 0), right

It should be (A / C) + (B / C) = (a + b) / C (C is not equal to 0)

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1. Let ABC not equal to 0, and find the value of fraction (a + b) (B + C) (c + a) / ABC. There are two answers, 8 and - 1. Let a + B-C / C = a + C-B / b = B + C-A / a = K
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