@ @pbjïØ Üa@ @QT 311 17 () () 86 , 87 , 88 , … . r () n () 12 < x < 16 x () () 200 7 () 500 < n < 2000 n 3 11 7 () 4 500 10 () 100000 () 160110 313 25 1000 < x < 10000 x VARIOUS 97 60 () () () ()