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單項(xiàng)選擇題

1/3,1/7,7/9,1/31.19/45,()

A.11/21
B.13/51
C.63/65
D.91/165

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單項(xiàng)選擇題

2.1,2.2,4.1,4.4,16.1()

A.32.4
B.16.4
C.32.16
D.16.16

單項(xiàng)選擇題

9,30,69,132,225,()

A.354
B.387
C.456
D.540