题目: 设x>0,y>0,M=x+y1+x+y,N=x1+x+y1+y,则M,N的大小关系是( )A.M=NB.M<NC.M>ND.不能确定 答案: ∵x>0,y>0,∴N-M=x1+x+y1+y-x+y1+x+y>x1+x+y+y1+x+y-x+y1+x+y=0,∴N>M.故选B.
题型:选择题 -What do you think of the party?---It is, of course, ___.A.wonderfulB.wellC.wonderfullyD.very happy 查看答案