10.
如图,一个机器人从O(0,0)点出发,向正东方向走3m,到达A1点,再向正北方向走6m到点A2,再向正西方向走9m到达点A3,再向正南方向走12m到达点A4,再向正东方向走15m到达点A5.按如此规律走下去,当机器人走到点A7点时,A7点的坐标是( )
| A. | (-12,12) | B. | (-9,12) | C. | (-12,-12) | D. | (-12,9) |
9.
如图,已知OP∥QR∥ST,则下列等式中正确的是( )
0 295358 295366 295372 295376 295382 295384 295388 295394 295396 295402 295408 295412 295414 295418 295424 295426 295432 295436 295438 295442 295444 295448 295450 295452 295453 295454 295456 295457 295458 295460 295462 295466 295468 295472 295474 295478 295484 295486 295492 295496 295498 295502 295508 295514 295516 295522 295526 295528 295534 295538 295544 295552 366461
| A. | ∠1+∠2-∠3=90° | B. | ∠1-∠2+∠3=180° | C. | ∠2+∠3-∠1=180° | D. | ∠1+∠2+∠3=180° |