a × (5/9) = b × (3/4) = c ÷(5/6) = e÷(7/4)
即：a × (5/9) = b × (3/4) = c ×（6/5) = e ×(4/7)
令 a × (5/9) = b × (3/4) = c ×（6/5) = e ×(4/7) = k
则有： a = ( 9/5)k = (108/60)k b = (4/3)k = (80/60)k
c = (5/6) k =(50/60)k d = (7/4)k = (105/60)k
所以： a > d > b > c
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