Multiple choice questions: if a, B and C are not equal to 0, and 1 of a + 1 of B + 1 of C = 1 of a + B + 1 of C, then a, B and C are three Number () A. There must be two opposite numbers. B. there must be two equal numbers. C. There must be the same sign. D. none of the above conclusions is correct

Multiple choice questions: if a, B and C are not equal to 0, and 1 of a + 1 of B + 1 of C = 1 of a + B + 1 of C, then a, B and C are three Number () A. There must be two opposite numbers. B. there must be two equal numbers. C. There must be the same sign. D. none of the above conclusions is correct

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