Task 1 Complete the following sentences with the appropriate words given in the brackets. Change the form if necessary. 1. A _____________ seldom feels guilty of his plagiarism. (plagiarism; plagiarist)
【简答题】已知n是,P n (x n ,y n )是反比例函数y= k x 图象上的一列点,其中x 1 =1,x 2 =2,…,x n =n,记T 1 =x 1 y 2 ,T 2 =x 2 y 3 ,…,T n =x n y n+1 ;若T 1 =1,则T 1 ?T 2 ?…?T n =______.