What is the man dream? A. To be a director. B. To be an actor. C. To be a teacher. 听第7段材料.回答第9至11题. 查看更多

 

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For real numbers a and b, define a$b=(a-b). What is (x-y)$(y-x)?______

 

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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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Don’t believe him. He is always        


  1. A.
    tell lie
  2. B.
    telling lie
  3. C.
    tell lies
  4. D.
    telling lies

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在△ABC中,角A,B,C所对的边为a,b,c,已知sin
C
2
=
10
4

(Ⅰ)求cosC的值;
(Ⅱ)若△ABC的面积为
3
15
4
,且sin2A+sin2B=
13
16
sin2C

(1)求a,b,c的值;
(2)若a<b<c已知f(x)=
b
sinωx+(a-c)cos2
ωx
2
(x∈R)
,其中ω>0对任意的t∈R,函数f(x)在x∈[t,t+π)的图象与直线y=-1有且仅有两个不同的交点,试确定ω的值(不必证明),并求出函数f(x)的单调增区间.

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已知函数f(x)=
1
3
x3-x2+3
,x∈[-1,t](t>-1),函数g(t)=
1
3
(t-2)2,t>-1

(Ⅰ)当0<t<1时,求函数f(x)的单调区间和最大、最小值;
(Ⅱ)求证:对于任意的t>-1,总存在x0∈(-1,t),使得x=x0是关于x的方程f′(x)=g(t)的解;并就k的取值情况讨论这样的x0的个数.

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