What is the man dream? A. To be a director. B. To be an actor. C. To be a teacher. 聽第7段材料.回答第9至11題. 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所對的邊為a,b,c,已知sin
C
2
=
10
4

(Ⅰ)求cosC的值;
(Ⅱ)若△ABC的面積為
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對任意的t∈R,函數(shù)f(x)在x∈[t,t+π)的圖象與直線y=-1有且僅有兩個不同的交點,試確定ω的值(不必證明),并求出函數(shù)f(x)的單調(diào)增區(qū)間.

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

(Ⅰ)當0<t<1時,求函數(shù)f(x)的單調(diào)區(qū)間和最大、最小值;
(Ⅱ)求證:對于任意的t>-1,總存在x0∈(-1,t),使得x=x0是關(guān)于x的方程f′(x)=g(t)的解;并就k的取值情況討論這樣的x0的個數(shù).

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