16.
如图,AB是⊙O的直径,弦DE⊥AB,C为垂足,弦DF与AB相交于点P,连接EF,EO,若AC=1,DE=2$\sqrt{3}$,∠EDF=45°,则图中阴影部分的面积( )
| A. | $\frac{1}{4}π-\frac{1}{2}$ | B. | $\frac{3}{4}π-\frac{3}{2}$ | C. | π | D. | π-2 |
12.下列代数式中,不是整式的是( )
0 293366 293374 293380 293384 293390 293392 293396 293402 293404 293410 293416 293420 293422 293426 293432 293434 293440 293444 293446 293450 293452 293456 293458 293460 293461 293462 293464 293465 293466 293468 293470 293474 293476 293480 293482 293486 293492 293494 293500 293504 293506 293510 293516 293522 293524 293530 293534 293536 293542 293546 293552 293560 366461
| A. | $\frac{{a}^{2}b}{3}$ | B. | $\frac{a+1}{4}$ | C. | 0 | D. | $\frac{{a}^{2}+b}{a}$ |