2X 2 () ()()1/42X+1 ( ) 9 () 3 ()1/2X () ()1/16 ()()

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2X 2 () ()()1/42X+1 ( ) 9 () 3 ()1/2X () ()1/16 ()()

2X 2 () ()()1/42X+1 ( ) 9 () 3 ()1/2X () ()1/16 ()()
2X 2 () ()()1/4
2X+1 ( ) 9 () 3 ()
1/2X () ()1/16 ()()

2X 2 () ()()1/42X+1 ( ) 9 () 3 ()1/2X () ()1/16 ()()
最后一行是 (1/2)x 吗
2X 2 (8) (1/4)(2) 1/4
2X+1 (3 ) 9 (5/4) 3 (5/4)
(1/2)X (1/2)(2) 1/16 (1/2)(1/16)