Question

5/7а + 3/14а при а =4 2/3;7/13

Answer 1

а * (5/7 + 3/14) = а * (10/14 + 3/14) = 13/14а.
При а = 4 2/3: 4 2/3 * 13/14 = 14/3 * 13/14 = 13/3 = 4 1/3,
При а = 7/13: 7/13 * 13/14 = 1/2