4.已知关于x的分式方程$\frac{k}{x+1}$+$\frac{x+k}{x-1}$=1的解为负数,则k的取值范围是( )
| A. | k<$\frac{1}{2}$且k≠0 | B. | k≤$\frac{1}{2}$且k≠0 | C. | k≥-$\frac{1}{2}$且k≠0 | D. | k>-$\frac{1}{2}$且k≠0 |
3.
如图,数轴上表示的关于x的一元一次不等式组的解集为( )
0 297469 297477 297483 297487 297493 297495 297499 297505 297507 297513 297519 297523 297525 297529 297535 297537 297543 297547 297549 297553 297555 297559 297561 297563 297564 297565 297567 297568 297569 297571 297573 297577 297579 297583 297585 297589 297595 297597 297603 297607 297609 297613 297619 297625 297627 297633 297637 297639 297645 297649 297655 297663 366461
| A. | x≥3 | B. | x>3 | C. | 3>x>-1 | D. | -1<x≤3 |