10.下列图形中,是轴对称图形的是( )
| A. | B. | C. | D. |
9.有下列长度的三条线段,能组成三角形的是( )
| A. | 2cm,3cm,4cm | B. | 1cm,4cm,2cm | C. | 1cm,2cm,3cm | D. | 6cm,2cm,3cm |
5.下列计算,正确的是( )
0 284471 284479 284485 284489 284495 284497 284501 284507 284509 284515 284521 284525 284527 284531 284537 284539 284545 284549 284551 284555 284557 284561 284563 284565 284566 284567 284569 284570 284571 284573 284575 284579 284581 284585 284587 284591 284597 284599 284605 284609 284611 284615 284621 284627 284629 284635 284639 284641 284647 284651 284657 284665 366461
| A. | (-2)-2=4 | B. | $\sqrt{{{(-2)}^2}}=-2$ | C. | 46÷(-2)6=64 | D. | $\sqrt{8}-\sqrt{2}=\sqrt{6}$ |