Trang cá nhân của 16.6a- nguyễn thị hồng nhiên

Trong các cách viết dưới đây, cách viết nào cho ta phân số?

A. $Title: {"mathml":"<math style=\"font-family:stix;font-size:16px;\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mstyle mathsize=\"16px\"><mfrac><mn>2</mn><mn>0</mn></mfrac></mstyle></math>"} - Description: 2 over 0$ B. $Title: {"mathml":"<math style=\"font-family:stix;font-size:16px;\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mstyle mathsize=\"16px\"><mfrac><mrow><mn>0</mn><mo>,</mo><mn>15</mn></mrow><mn>3</mn></mfrac></mstyle></math>"} - Description: fraction numerator 0 comma 15 over denominator 3 end fraction$ C. $Title: {"mathml":"<math style=\"font-family:stix;font-size:16px;\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mstyle mathsize=\"16px\"><mfrac><mn>2</mn><mrow><mo>-</mo><mn>9</mn></mrow></mfrac></mstyle></math>"} - Description: fraction numerator 2 over denominator negative 9 end fraction$ D. $Title: {"mathml":"<math style=\"font-family:stix;font-size:16px;\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mstyle mathsize=\"16px\"><mfrac><mrow><mn>1</mn><mo>,</mo><mn>2</mn></mrow><mn>9</mn></mfrac></mstyle></math>"} - Description: fraction numerator 1 comma 2 over denominator 9 end fraction$