6、用符号∈或填空;
(1)1_________N,0_______N,-3________Q,__________Z,_________Q,________R;
(2)______________________;
(3)3________{x|x=n2+1,n∈N},5________{x|x=n2+1,n∈N};
(4)(-1,1)__________{y|y=x2},(-1,1) ________{(x,y)|y=x2};
(5)设,集合,则x________M,y_________M.