1/9, 1/28 , ( ), 1/126

A.1/55 B.1/54 C.1/65 D. 1/75

2023-06-13



参考答案:C

先观察分母,9=23+1,28=33+1,126=53+1,则可推出空白项分母为43+1=65。故正确选项为C。