At what time of the school term does the conversation most probably take place? A.At the end of it. B.In the middle of it. C.At the beginning of it. 查看更多

 

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A semipro baseball league has teams with 21 players each. League rules state that a player must be paid at least $15,000,and that the total of all players’ salaries for each team cannot exceed $700,000. What is the maximum possible salary,in dollars,for a single player?

A. 270,000    B. 385,000    C. 400,000    D. 430,000    E.700,000

 

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精英家教网已知△ABC的边AB所在直线的方程为x-3y-6=0,M(2,0)满足
BM
=
MC
,点T(-1,1)在AC所在直线上且
AT
AB
=0
.   
(1)求△ABC外接圆的方程;
(2)一动圆过点N(-2,0),且与△ABC的外接圆外切,求此动圆圆心的轨迹方程Γ;
(3)过点A斜率为k的直线与曲线Γ交于相异的P,Q两点,满足
OP
OQ
>6
,求k的取值范围.

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已知直线l:
x=2+t
y=1-at
(t为参数),与椭圆x2+4y2=16交于A、B两点.
(1)若A,B的中点为P(2,1),求|AB|;
(2)若P(2,1)是弦AB的一个三等分点,求直线l的直角坐标方程.

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17、如图,四边形ABCD内接于⊙O,AB=BC.AT是⊙O的切线,∠BAT=55°,则∠D等于
110°

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已知A,B是抛物线x2=2py(p>0)上的两点,F为抛物线的焦点,l为抛物线的准线.
(1)若过A点的抛物线的切线与y轴相交于C点,求证:|AF|=|CF|;
(2)若
OA
OB
+p2=0
(A、B异于原点),直线OB与过A且垂直于X轴的直线m相交于P点,求P点轨迹方程;
(3)若直线AB过抛物线的焦点,分别过A、B点的抛物线的切线相交于点T,求证:
AT
BT
=0
,并且点T在l上.

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