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一、选择题(本大题共10小题,每小题4分,共40分.在每小题给出的4个选项中,只有一项是符合题目要求的)1.已知集合P=Q=R,若给定P→Q的映射f:(x,y)→(x+y,x-y),则Q中的元素(2,1)在P中对应的元素是()(A)(3,1)(B)(1,3)(C)32,21(D)32,-212.设RM={x|x0},则集合M为()(A){x|x0}(B){x|x
First, the multiple-choice questions (the title of a total of 10 small questions, each question 4 points, a total of 40 points. Among the 4 options given in each question, only one is in line with the requirements of the title) 1. Known set P =Q=R, given the mapping of P→Q f:(x,y)→(x+y,xy), then the corresponding element of element (2,1) in Q in P is ()(A (3,1)(B)(1,3)(C)32,21(D)32,-212. Let RM={x|x0}, then the set M is ()(A){x|x0 }(B){x|x