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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精英家教網(wǎng)已知△ABC的邊AB所在直線的方程為x-3y-6=0,M(2,0)滿足
BM
=
MC
,點(diǎn)T(-1,1)在AC所在直線上且
AT
AB
=0
.   
(1)求△ABC外接圓的方程;
(2)一動(dòng)圓過點(diǎn)N(-2,0),且與△ABC的外接圓外切,求此動(dòng)圓圓心的軌跡方程Γ;
(3)過點(diǎn)A斜率為k的直線與曲線Γ交于相異的P,Q兩點(diǎn),滿足
OP
OQ
>6
,求k的取值范圍.

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已知直線l:
x=2+t
y=1-at
(t為參數(shù)),與橢圓x2+4y2=16交于A、B兩點(diǎn).
(1)若A,B的中點(diǎn)為P(2,1),求|AB|;
(2)若P(2,1)是弦AB的一個(gè)三等分點(diǎn),求直線l的直角坐標(biāo)方程.

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17、如圖,四邊形ABCD內(nèi)接于⊙O,AB=BC.AT是⊙O的切線,∠BAT=55°,則∠D等于
110°

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已知A,B是拋物線x2=2py(p>0)上的兩點(diǎn),F(xiàn)為拋物線的焦點(diǎn),l為拋物線的準(zhǔn)線.
(1)若過A點(diǎn)的拋物線的切線與y軸相交于C點(diǎn),求證:|AF|=|CF|;
(2)若
OA
OB
+p2=0
(A、B異于原點(diǎn)),直線OB與過A且垂直于X軸的直線m相交于P點(diǎn),求P點(diǎn)軌跡方程;
(3)若直線AB過拋物線的焦點(diǎn),分別過A、B點(diǎn)的拋物線的切線相交于點(diǎn)T,求證:
AT
BT
=0
,并且點(diǎn)T在l上.

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