【简答题】若函数f(x)满足:在定义域D内存在实数x 0 ,使得f(x 0 +1)=f(x 0 )+f(1)成立,则称函数f(x)为“1的饱和函数”.有下列函数: ①f(x)= 1 x ;②f(x)= 2 x ; ③f(x)=lg(x 2 +2); ④f(x)=cosπx, 其中你认为是“1的饱和函数”的所有函数的序号为______.
【单选题】Mrs.Frobisher helped catch the bank robber because .
A.
he just happened to be in his way of escape
B.
she happened to wave her stick in the air and hit him
C.
she had a sense of what’s right and what’s wrong
D.
she wanted to prove that she was not so useless
【简答题】若函数f(x)的定义域是[0,1],则f(x+a)?f(x-a)(0<a< 1 2 )的定义域是 ______.
【简答题】若函数 f(x)= 1 x+1 ,则函数y=f(f(x))的定义域为______.
【简答题】若函数f(x)的定义域为[0,4],则 g(x)= f(2x) x-1 的定义域为______.
【简答题】若函数f(x)的定义域是[0,1],则函数f(2x)-f(x+ )的定义域为( )。