1,1/2,3/13,1/10,5/121,()。
A. 7/144 B. 3/182 C. 5/169 D. 9/196
81,64,121,36,( ),16A.144B.169C.196D.225
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1,4,16,49,121,( )。A.256B.225C.196D.169
1,1/2,3/13,1/10,5/121,()。A. 7/144B. 3/182C. 5/169D. 9/196
1,1/2,3/13,1/10,5/121,( )。A.7/144B.3/182C.5/169D.9/196
1,9,25,49,121,( ) A.144 B.154 C.169 D.177
2, 5, 12, 29, 70, ( )。A.100B.121C.144D.169
:225, 196, 169,( ),121A.100 B.144 C.125 D.121