A、B、C三个数,A的2/3 等于B的4/7 ,B的2/3 又等于C的4/7 ,C比A大1/3,则B是
问题描述:
A、B、C三个数,A的2/3 等于B的4/7 ,B的2/3 又等于C的4/7 ,C比A大1/3,则B是
答
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