已知 , , ,则( )
A. |
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B. |
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C. |
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D. |
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给定映射:
,在映射
下(3,1)的原象为()
A.(1,3) | B.(1,1) | C.(3,1) | D.(![]() |
设全集,集合
,
,则
等于()
A.![]() |
B.![]() |
C.![]() |
D.![]() |
某租赁公司拥有汽车100辆,当每辆车的月租金为3000元时,可全部租出;当每辆车的月租金每增加50元时,未租出的车将会增加一辆。租出的车每辆每月需维护费150元,未租出的车每辆每月需要维护费50元。
(1)当每辆车的月租金定为3600元时,能租出多少辆车?
(2)当每辆车的月租金定为多少元时,租赁公司的月收益最大?最大月收益是多少?
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 |
当0<a<1时,下列不等式成立的是
A.a![]() ![]() |
B.log![]() ![]() |
C.a![]() ![]() |
D.log![]() ![]() |