Câu hỏi

Cho các số hữu tỉ x = a, y = (a, b, c ∈ Z, c ≠ 0). Tổng x + y bằng: A. a   +   2 b c 2 c " 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style="width: 65.33px; height: 36.00px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="fraction numerator a space plus space 2 b c over denominator 2 c end fraction"> B. a   -   2 b c 2 c " 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style="width: 65.33px; height: 36.00px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="fraction numerator a space minus space 2 b c over denominator 2 c end fraction"> C. 2 a c   +   b 2 c " 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style="width: 65.33px; height: 36.00px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="fraction numerator 2 a c space plus space b over denominator 2 c end fraction"> D. 2 a c   -   b 2 c " 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style="width: 65.33px; height: 36.00px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="fraction numerator 2 a c space minus space b over denominator 2 c end fraction">