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13,求B.

A * 2/3 = B * 4/7 A = B * 6/7B * 2/3 = C *4/7C = 7/6 BC - A = (7/6 - 6/7)B = 1/3B = 14/13A =14/13 * 6/7 = 12/13C = 14/13 * 7/6 =49/39 刚才回答过了 记得把那个提问也采纳.