8.下列函数中,可能是奇函数的是( )
| A. | f(x)=x2+ax+1,a∈R | B. | f(x)=x+2a-1,a∈R | ||
| C. | f(x)=log2(ax2-1),a∈R | D. | f(x)=(x-a)|x|,a∈R |
7.函数f(x)=$\sqrt{-2+lo{g}_{2}x}$的定义域是( )
0 233508 233516 233522 233526 233532 233534 233538 233544 233546 233552 233558 233562 233564 233568 233574 233576 233582 233586 233588 233592 233594 233598 233600 233602 233603 233604 233606 233607 233608 233610 233612 233616 233618 233622 233624 233628 233634 233636 233642 233646 233648 233652 233658 233664 233666 233672 233676 233678 233684 233688 233694 233702 266669
| A. | (0,4) | B. | (4,+∞) | C. | [4,+∞) | D. | (-4,4) |