1,1,9,27,25,()。
A.21
B.100
C.125
D.144
1.16,8.25,27.36,64.49,() A.65.25;B.125.64;C.125.
1,2,3,1,9,1/2,()。 A.25 B.27 C.23 D.21
1,9,36,100,() A.81 B.27 C.125 D.225
1,9,36,100,()A.81 B.27 C.125 D.225
4 27 16 25 36 23 64 21 ()A.81 B.100 C.121 D.144