8.已知∠AOB=50°,∠BOC=30°,OD平分∠AOC,则∠AOD的度数为( )
| A. | 20° | B. | 80° | C. | 10°或40° | D. | 20°或80° |
4.已知点P的坐标(2a,6-a),且点P到两坐标轴的距离相等,则点P的坐标是( )
0 284312 284320 284326 284330 284336 284338 284342 284348 284350 284356 284362 284366 284368 284372 284378 284380 284386 284390 284392 284396 284398 284402 284404 284406 284407 284408 284410 284411 284412 284414 284416 284420 284422 284426 284428 284432 284438 284440 284446 284450 284452 284456 284462 284468 284470 284476 284480 284482 284488 284492 284498 284506 366461
| A. | (12,-12)或(4,-4) | B. | (-12,12)或(4,4) | C. | (-12,12) | D. | (4,4) |