4.n边形的边数每增加一条,其对角线增加( )
| A. | n条 | B. | (n-1)条 | C. | (n-2)条 | D. | (n-3)条 |
2.若m,n是方程x2-x-2014=0的两根,则代数式(m2-2m-2014)×(-n2+2n+2014)的值为( )
0 308239 308247 308253 308257 308263 308265 308269 308275 308277 308283 308289 308293 308295 308299 308305 308307 308313 308317 308319 308323 308325 308329 308331 308333 308334 308335 308337 308338 308339 308341 308343 308347 308349 308353 308355 308359 308365 308367 308373 308377 308379 308383 308389 308395 308397 308403 308407 308409 308415 308419 308425 308433 366461
| A. | -2014 | B. | 2014 | C. | 0 | D. | 1 |