14.下列各运算中,计算正确的是( )
0 289939 289947 289953 289957 289963 289965 289969 289975 289977 289983 289989 289993 289995 289999 290005 290007 290013 290017 290019 290023 290025 290029 290031 290033 290034 290035 290037 290038 290039 290041 290043 290047 290049 290053 290055 290059 290065 290067 290073 290077 290079 290083 290089 290095 290097 290103 290107 290109 290115 290119 290125 290133 366461
| A. | a3•a4=a7 | B. | (a2)3=a5 | C. | 4a2-2a2=2 | D. | (3a)2=6a2 |