7.下列图案中,不是轴对称图形的是( )
| A. | B. | C. | D. |
5.
正方形ABCD、正方形BEFG、正方形RKPF的位置如图所示,点G在线段DK上,正方形ABCD的边长为a,正方形BEFG的边长为b、正方形RKPF的边长为c,则△DEK的面积是( )
0 286087 286095 286101 286105 286111 286113 286117 286123 286125 286131 286137 286141 286143 286147 286153 286155 286161 286165 286167 286171 286173 286177 286179 286181 286182 286183 286185 286186 286187 286189 286191 286195 286197 286201 286203 286207 286213 286215 286221 286225 286227 286231 286237 286243 286245 286251 286255 286257 286263 286267 286273 286281 366461
| A. | b2 | B. | bc | C. | ab | D. | 0.5a2 |