【简答题】已知向量 m =( e x ,lnx+k) , n =(1,f(x)) , m ∥ n (k为常数,e是自然对数的底数),曲线y=f(x)在点(1,f(1))处的切线与y轴垂直,F(x)=xe x f′(x). (Ⅰ)求k的值及F(x)的单调区间; (Ⅱ)已知函数g(x)=-x 2 +2ax(a为正实数),若对于任意x 2 ∈[0,1],总存在x 1 ∈(0,+∞),使得g(x 2 )<F(x 1...
【单选题】In May, SSG, general taxpayer, mainly engaged in design service, got Millions RMB for its services and issued special invoice. Which tax rate is applicable? ( )
【简答题】已知向量 m =( x 2 ,y-cx) , n =(1,x+b) , m ∥ n ,(x,y,b,c∈R),且把其中x,y所满足的关系式记为y=f(x),若f′(x)为f(x)的导函数,F(x)=f(x)+af′(x)(a>0),且F(x)是R上的奇函数. (Ⅰ)求 b a 和c的值; (Ⅱ)若函数f(x)在 [ a 2 , a 2 ] 上单调递减,求b的取值范围; (Ⅲ)当a=2时,设0<t<...