5.
如图:△ADB、△BCD均为等边三角形,若点顶点A、C均在反比例函数y=$\frac{k}{x}$上,若C的坐标点(a、$\sqrt{3}$),则k的值为( )
| A. | 2$\sqrt{3}$ | B. | 3$\sqrt{3}$+$\sqrt{6}$ | C. | 3$\sqrt{3}$+2$\sqrt{6}$ | D. | 2$\sqrt{6}$ |
4.下列命题是假命题的是( )
| A. | 若a2=b2,则a=b | |
| B. | 两直线平行,同位角相等 | |
| C. | 对顶角相等 | |
| D. | 若b2-4ac>0,则方程ax2+bx+c=0(a≠0)有两个不等的实数根 |
3.江油这个春节旅游窗口大放异彩,取得开门红,据统计春节期间旅游综合收入40619.94万元,请你把40619.94万元用科学记数法表示为( )
| A. | 4.061994×105万元 | B. | 4.061994×106万元 | ||
| C. | 4.061994×104万元 | D. | 40.61994×103万元 |
1.
如图,等边△ABC是⊙O的内接三角形,P是$\widehat{BC}$上一点,当PB=3PC时,则△ABC与四边形ABPC的面积比为( )
0 294377 294385 294391 294395 294401 294403 294407 294413 294415 294421 294427 294431 294433 294437 294443 294445 294451 294455 294457 294461 294463 294467 294469 294471 294472 294473 294475 294476 294477 294479 294481 294485 294487 294491 294493 294497 294503 294505 294511 294515 294517 294521 294527 294533 294535 294541 294545 294547 294553 294557 294563 294571 366461
| A. | $\frac{13}{16}$ | B. | $\frac{10}{13}$ | C. | $\frac{9}{11}$ | D. | $\frac{7}{9}$ |