7.关于x的分式方程$\frac{2x-m}{x+1}$=3的解是负数,则字母m的取值范围是( )
| A. | m>3 | B. | m≥-3 | C. | m>-3 且m≠-2 | D. | m≤-3 |
6.
如图,在平面直角坐标系中,已知点A(-3,6)、B(-9,-3),以原点O为位似中心,相似比为$\frac{1}{3}$,把△ABO缩小,则点B的对应点B′的坐标是( )
0 294378 294386 294392 294396 294402 294404 294408 294414 294416 294422 294428 294432 294434 294438 294444 294446 294452 294456 294458 294462 294464 294468 294470 294472 294473 294474 294476 294477 294478 294480 294482 294486 294488 294492 294494 294498 294504 294506 294512 294516 294518 294522 294528 294534 294536 294542 294546 294548 294554 294558 294564 294572 366461
| A. | (-3,-1) | B. | (-1,2) | C. | (-9,1)或(9,-1) | D. | (-3,-1)或(3,1) |