4.代数式2016-a2+2ab-b2的最大值是( )
0 282087 282095 282101 282105 282111 282113 282117 282123 282125 282131 282137 282141 282143 282147 282153 282155 282161 282165 282167 282171 282173 282177 282179 282181 282182 282183 282185 282186 282187 282189 282191 282195 282197 282201 282203 282207 282213 282215 282221 282225 282227 282231 282237 282243 282245 282251 282255 282257 282263 282267 282273 282281 366461
| A. | 2015 | B. | 2016 | C. | 2017 | D. | 不存在 |