8.函数$y=(a-2){x^{{a^2}-2}}$是反比例函数,则a的值是( )
| A. | 1或-1 | B. | -2 | C. | 2 | D. | 2或-2 |
5.
如图,在?ABCD中,分别以A,C为圆心,大于$\frac{1}{2}$AC长为半径画弧,相交于点M,N,直线MN与BC,AD分别相交于点E,F,则在四边形AECF中一定有( )
0 282536 282544 282550 282554 282560 282562 282566 282572 282574 282580 282586 282590 282592 282596 282602 282604 282610 282614 282616 282620 282622 282626 282628 282630 282631 282632 282634 282635 282636 282638 282640 282644 282646 282650 282652 282656 282662 282664 282670 282674 282676 282680 282686 282692 282694 282700 282704 282706 282712 282716 282722 282730 366461
| A. | AE=AF | B. | AC=EF | C. | ∠EAF=90° | D. | ∠AFE=45° |