【简答题】Part 3: Reading Comprehension II Directions: There are four passages in this part. Each passage is followed by some questions. For each of them there are four choices marked A, B, C and D. You should ...
【简答题】已知定义在R上的函数f(x)满足:, f(1)= 5 2 ,且对于任意实数x,y,总有f(x)f(y)=f(x+y)+f(x-y)成立. (I)求f(0)的值,并证明函数f(x)为偶函数; (II)定义数列{a n }:a n =2f(n+1)-f(n)(n=1,2,3,…),求证:{a n }为等比数列; (III)若对于任意非零实数y,总有f(y)>2.设有理数x 1 ,x 2 满足|x 1 ...
【判断题】如果劳动力市场是完全竞争的,企业只能接受既定的市场工资和其产品的市场价格。