abc3个数a的2/3等于b的4/7地的2/3又等于c的4/7,cba大使三者币是多少?

A * 2/3 = B * 4/7
A = B * 6/7
B * 2/3 = C *4/7
C = 7/6 B
C - A = (7/6 - 6/7)B = 1/3
B = 14/13
A =14/13 * 6/7 = 12/13
C = 14/13 * 7/6 =49/39