6.若不等式a(x-1)-5(2x-3)≥4-3x的解集为x≤2,则a的值为( )
| A. | 1 | B. | 2 | C. | -2 | D. | 3 |
5.要使$\sqrt{\frac{8}{x-2}}$有意义,则x的取值范围是( )
| A. | x<2 | B. | x>2 | C. | x≤2 | D. | x>0且x≠2 |
4.⊙O中,弧AB的长度为弧MN的2倍,则下列关于弦的结论正确的是( )
0 295505 295513 295519 295523 295529 295531 295535 295541 295543 295549 295555 295559 295561 295565 295571 295573 295579 295583 295585 295589 295591 295595 295597 295599 295600 295601 295603 295604 295605 295607 295609 295613 295615 295619 295621 295625 295631 295633 295639 295643 295645 295649 295655 295661 295663 295669 295673 295675 295681 295685 295691 295699 366461
| A. | AB>2MN | B. | AB=2MN | ||
| C. | AB<2MN | D. | AB与2MN的大小不能确定 |