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题目列表(包括答案和解析)

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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Ahyperbola(双曲线)wjthvertices(顶点)(-2,5)and(-2,-3),has  an  asynptote(渐近线)that passes  the   point(2.5)  Then  an  equarionk  of  the  hyperbola  is

A.B.
C.D.

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某气象仪器研究所按以下方案测试一种“弹射型”气象观测仪器的垂直弹射高度:在C处进行该仪器的垂直弹射,观察点A、B两地相距100m,∠BAC=60°,在A地听到弹射声音的时间比B地晚
217
s.A地测得该仪器在C处时的俯角为15°,A地测得最高点H的仰角为30°,求该仪器的垂直弹射高度CH.(声音的传播速度为340m/s)

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精英家教网如图,在△ABC中,已知CA=2,CB=3,∠ACB=60°,CH为AB边上的高.
(1)求
AB
•
BC
;
(2)设
CH
=m
CB
+n
CA
,其中m,n∈R,求m,n的值.

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在三棱锥S-ABC中,侧棱SA、SB、SC两两垂直且长度均为a,点H在BC上,且SH⊥BC,则sin∠HAS的值为
3
3
3
3
.

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