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        1. 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

           

          題目列表(包括答案和解析)

          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(gè)不同的交點(diǎn),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(dāng)0<t<1時(shí),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(gè)數(shù).

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