8.
如图所示是三个反比例函数y1=$\frac{{k}_{1}}{x}$,y2=$\frac{{k}_{2}}{x}$,y3=$\frac{{k}_{3}}{x}$在y轴右边的图象,由此观察得到k1、k2、k3的大小关系是( )
| A. | k1>k2>k3 | B. | k1>k3>k2 | C. | k2>k3>k1 | D. | k3>k2>k1 |
7.
如图,圆环的面积为( )
0 290371 290379 290385 290389 290395 290397 290401 290407 290409 290415 290421 290425 290427 290431 290437 290439 290445 290449 290451 290455 290457 290461 290463 290465 290466 290467 290469 290470 290471 290473 290475 290479 290481 290485 290487 290491 290497 290499 290505 290509 290511 290515 290521 290527 290529 290535 290539 290541 290547 290551 290557 290565 366461
| A. | R2-r2 | B. | π(R2-r2) | C. | πR2-r2 | D. | πr2-πR2 |