15.若点(x1,y1)、(x2,y2)、(x3,y3)都是反比例函数y=$\frac{\sqrt{3}-2}{x}$图象上的点,且且x1<x2<0<x3,则下列正确的是( )
| A. | y1>y2>y3 | B. | y2>y3>y1 | C. | y2>y1>y3 | D. | y1>y3>y2 |
14.下列计算正确的是( )
| A. | a2+a2=a4 | B. | a6÷a3=a2 | C. | 4x3-3x2=1 | D. | (-2x2y)3=-8x6y3 |
11.如图1,E为矩形ABCD边AD上一点,点P从点B沿折线BE-ED-DC运动到点C时停止,点Q从点B沿BC运动到点C时停止,它们运动的速度都是1cm/s.若P,Q同时开始运动.设运动时间为t(s),△BPQ的面积为y(cm2).已知y与t的函数图象如图2,则下列结论错误的是( )

| A. | AE=6cm | B. | sin∠EBC=0.8 | ||
| C. | 当0<t≤10时,y=0.4t2 | D. | 当t=12s时,△PBQ是等腰三角形 |
10.五一期间,绿化部门预在县城主要干道旁边种植A,B两种花木共6600棵,若A花木数量是B花木数量的2倍少600棵,求A、B两种花木的数量分别是多少棵?若设A,B花木各x棵,y棵,则有( )
| A. | $\left\{\begin{array}{l}{x+y=6600}\\{x=2y+600}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x+y=6600}\\{y=2x+600}\end{array}\right.$ | ||
| C. | $\left\{\begin{array}{l}{x+y=6600}\\{y=2x-600}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x+y=6600}\\{x=2y-600}\end{array}\right.$ |
7.
如图,菱形ABCD的四个顶点均在坐标轴上,对角线AC、BD交于原点O,DF⊥AB交AC于点G,反比例函数y=$\frac{\sqrt{3}}{x}$(x>0)经过线段DC的中点E,若BD=4,则AG的长为( )
0 284819 284827 284833 284837 284843 284845 284849 284855 284857 284863 284869 284873 284875 284879 284885 284887 284893 284897 284899 284903 284905 284909 284911 284913 284914 284915 284917 284918 284919 284921 284923 284927 284929 284933 284935 284939 284945 284947 284953 284957 284959 284963 284969 284975 284977 284983 284987 284989 284995 284999 285005 285013 366461
| A. | $\frac{4\sqrt{3}}{3}$ | B. | $\sqrt{3}$+2 | C. | 2$\sqrt{3}$+1 | D. | $\frac{3\sqrt{3}}{2}$+1 |