2/5,3/7,4/10,6/14,8/20,12/28,()
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2/5, 3/7, 4/10, 6/14, 8/20, 12/28, ( )
A.224/56
B.14/32
C.20/48
D.16/40
参考答案:
2/5, 3/7, 4/10, 6/14, 8/20, 12/28, ( )
A.224/56
B.14/32
C.20/48
D.16/40
参考答案: