9.下列各数中,最小的数是( )
| A. | 75 | B. | 11111(2) | C. | 210(6) | D. | 85(9) |
20.设函数f(x)=(x2-8x+c1)(x2-8x+c2)(x2-8x+c3)(x2-8x+c4),集合M={x|f(x)=0}={x1,x2,x3,…,x7}⊆N*,设c1≥c2≥c3≥c4则c1-c4=( )
0 234564 234572 234578 234582 234588 234590 234594 234600 234602 234608 234614 234618 234620 234624 234630 234632 234638 234642 234644 234648 234650 234654 234656 234658 234659 234660 234662 234663 234664 234666 234668 234672 234674 234678 234680 234684 234690 234692 234698 234702 234704 234708 234714 234720 234722 234728 234732 234734 234740 234744 234750 234758 266669
| A. | 11 | B. | 13 | C. | 7 | D. | 9 |